Wednesday

September 17, 2014

September 17, 2014

Number of results: 65,732

**Physics**

A ball is thrown vertically up and from the ground with a velocity of 20ms. Calculate: a-The maximum length reached. b-The time to reach the maximum height. c-The time to reach the ground again after the ball is thrown up. d-The velocity reached halfway to the maximum height. ...
*September 23, 2011 by Hauwart*

**Physics**

A projectile (mass = 0.17 kg) is fired at and embeds itself in a target (mass = 2.84 kg). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off ...
*January 22, 2013 by Help*

**physics**

A projectile is launched over level ground at a launch angle of 70o with an initial velocity vo. At some later time while the projectile is on its way to the peak in its trajectory, its velocity vector makes an angle of 50o with respect to the horizontal. What is the magnitude...
*July 29, 2013 by billo*

**Physics**

The stored potential energy in the trampoline at maximum compression, (1/2) k X^2, equals the gravitational potential energy at maximum height, M g H. (Kinetic energy is zero in both cases) X = 0.5 m g = 9.8 m/s^2 H = 2.5 m k = the spring constant. Solve for k. k = 2MgH/X^2 A ...
*March 13, 2007 by drwls*

**Physics Help Please :(**

Projectile Motion A rifle is fired horizontally and travels 200m East. The rifle barrel is 1.90m from the ground. What speed must the bullet have been traveling at? Ignore Friction.
*January 18, 2011 by Jarrid*

**physic**

Two balls are conneted by a string that stretches over a massless, frictionless pulley. Ball 1 has a mass of 0.81 kg and is held 0.5 m above the ground. Ball 2 has a mass of 6.3 kg and is held 0.28 m above the ground. When the balls are released, ball 2 falls to the ground, ...
*January 15, 2012 by Anonymous*

**Algebra**

The formula h=280t-7t^2 gives the height, h in meters, of a rocket t seconds after take off. The maximum height reached by the rocket is 2800 m. How long will it take the rocket to reach this maximum height?
*January 29, 2013 by chase*

**Physics (PROJECTILE MOTION)**

Henrietta is going off to her physics class, jogging down the sidewalk at a speed of 2.05 m/s. Her husband Bruce suddenly realizes that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apartment, which is a height 43.9 m above the...
*February 8, 2012 by Beck*

**physics**

An object of mass 26 kg is thrown straight upwards from the ground at 27 m/s. Due to air resistance (a non-conservative force), the object loses some of its initial energy during its trip to reach maximum height and only travels to a height above the ground of 16.3 meters. ...
*October 31, 2012 by Chelsea*

**Physics**

In an electric shaver, the blade moves back and forth over a distance of 2.2 mm in simple harmonic motion, with frequency 116 Hz. Find (a) the amplitude (in mm), (b) the maximum blade speed, and (c) the magnitude of the maximum blade acceleration. I got that (a) is 1.1 mm, but...
*December 5, 2011 by Lisa*

**Physics**

A model rocket is launched straight upward with an initial speed of 57.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 190 m. (a) What is the maximum height reached by the rocket? (b) How long after liftoff does ...
*September 11, 2013 by <3*

**Math**

13. A catapult launches a boulder with an upward velocity of 148 ft/s. The height of the boulder (h) in feet after t seconds is given by the function h = –16t² + 148t + 30. How long does it take the boulder to reach its maximum height? What is the boulder’s maximum height? ...
*March 11, 2013 by Jim*

**Physics**

For a given initial projectile speed, you observe that the projectile has a certain range R at a launch angle A = 30 degrees. For what other launch angle will the projectile have the same range (assuming the same initial projectile speed)? Without the use of mathematical ...
*February 17, 2014 by Tim*

**Physics**

A projectile is shot from the edge of a cliff h = 225 m above ground level with an initial speed of v0 = 155 m/s at an angle of 37.0° with the horizontal a. Determine the time taken by the projectile to hit point P at ground level. b. Determine the range X of the projectile as...
*September 17, 2011 by Bridge*

**Physics (last question)**

A 800 kg projectile is fired vertically upward with an intitial velocity of 50 m/s. Assuming that no friction is present, how high above the ground will the projectile travel?
*November 15, 2007 by Elizabeth*

**maths**

(b) A stone is thrown straight up with velocity 14 m s-1 Calculate (i) The time taken for the stone to reach the top of its motion (ii) The time taken for it to reach the ground again (iii) The maximum height it reaches (iv) What is the velocity of the stone at height 8.0 m?
*March 13, 2013 by Kate*

**physics**

A particle with a mass of 3.00 10-20 kg is oscillating with simple harmonic motion with a period of 7.00 10-5 s and a maximum speed of 4.50 103 m/s. (a) Calculate the angular frequency of the particle. rad/s (b) Calculate the maximum displacement of the particle. m
*November 19, 2012 by Pipsy*

**Physics**

A ball of mass oscillates on a spring with spring constant = 200 . The ball's position is described by (0.350 ) 16.0 with measured in seconds. -What is the amplitude of the ball's motion? -What is the frequency of the ball's motion? -What is the value of the mass ? - Ronald ...
*April 28, 2010 by R*

**physics**

A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? m (b) How long after lift-off ...
*September 6, 2010 by frank*

**physics**

A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? (b) How long after lift-off does ...
*September 7, 2010 by tommy *

**physics**

model rocket is launched straight upward with an initial speed of 50.0 m/s. It accelerates with a constant upward acceleration of 1.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? m (b) How long after lift-off does...
*September 8, 2010 by harry*

**Physics**

A model rocket is launched upward with an initial speed of 50 m/s. It accelerates with a net constant upward acceleration of 2.0 m/s^2 until its engines stop at an altitude of 150 m. (a) What is the maximum height reached by the rocket? (b) how long after the life-off does the...
*September 24, 2010 by Mark*

**physics**

A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 170 m. (a) What is the maximum height reached by the rocket? (b) How long after lift-off does ...
*September 15, 2011 by ashley*

**physics**

A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until its engines stop at an altitude of 170 m. (a) What is the maximum height reached by the rocket? m (b) How long after lift-off ...
*January 22, 2012 by desperate help*

**Physics**

A model rocket is launched straight upward with an install speed of 57.6 m/s. it accelerates with a constant upward acceleration of 1.70m/s^2 until its engines stop at an altitude of 240m. A. What is the maximum height reached by the rocket? The acceleration of gravity is 9....
*September 11, 2013 by Ashley*

**physics**

stephanie serves a volleyball from a height of .8m and gives it an initial velocity of 7.6m/s straight up. how high will it go? how long will it take to reach maximum height?
*October 3, 2011 by evan*

**Algebra**

A baseball player hits a baseball into the air with an initial vertical velocity of 48 feet per second from a height of 3 feet. 8. Write an equation that gives the baseball’s height as a function of the time (in seconds) after it is hit. 9. After how many seconds does the ...
*March 31, 2013 by Elizabeth*

**Physics**

A ship maneuvers to within 2500 m of an island's 1800 m high mountain peak and fires a projectile at an enemy ship 610 m on the other side of the peak, as illustrated in Figure 3-29. If the ship shoots the projectile with an initial velocity of v = 248 m/s at an angle of θ...
*March 22, 2013 by Nicola*

**Physics**

A ship maneuvers to within 2500 m of an island's 1800 m high mountain peak and fires a projectile at an enemy ship 610 m on the other side of the peak, as illustrated in Figure 3-29. If the ship shoots the projectile with an initial velocity of v = 248 m/s at an angle of θ...
*March 22, 2013 by Nicola*

**physics**

A model rocket is launched straight upward with an initial speed of 50m/s. It acccelerates with a constant upward acceleration of 2m/s^2 until its engines stop at an altitude of 150m. (a)What is the maximum height reached by the rocket? (b)How long after lift-off does the ...
*September 14, 2007 by Anonymous*

**physics**

Think of a projectile motion on an inclined table with the inclination angle α=6.The elevation angle is θ=30 and V0 is 40 cm/s. What is the percentage error (approximately) in hmax if the measured value of hmax is 5 cm? (sin6=0.1, g=10 m/s2)
*December 21, 2012 by anonymous*

**Physics**

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 27 m high. When it hits the ground at the base of the cliff the rock has a speed of 24 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...
*March 29, 2010 by Carden*

**college physics**

(Projectile Motion) You are being asked to bombard an enemy fortress that sits on a 40 m tall cliff 100 m from your location. Your cannon has an elevation of 37 degrees. What velocity must your cannonball have to hit the walls of the fortress?
*November 29, 2009 by dave*

**physics**

A projectile is fired from the ground level with initial velocity of 90m/s at an angle of 36degre from horizontal. find the magnitude and direct of projectile 5 secs after firring
*February 6, 2010 by Anonymous*

**physics**

A projectile is fired from the ground level with initial velocity of 90m/s at an angle of 36degre from horizontal. find the magnitude and direct of projectile 5 secs after firring
*February 6, 2010 by Anonymous*

**physics**

A projectile is launched with an initial speed of 70 m/s at an angle of 35° above the horizontal on flat ground. Neglect air friction. A)What is the projectile's velocity at the highest point of its trajectory?
*September 17, 2012 by Cyrus*

**Physics**

If a bullet is fired with the speed of 6.0x10² m/s horizontally from a height of 48 m, how long will it take to hit the ground? What is The range of projectile? Assume that there is no air resistance.
*August 15, 2011 by Confuzzled*

**math**

I forgot how to solve this grade 11 review package question 5) A graph representing the vertical height in metres after t seconds, has been modelled by the equation f(t)= -4.9t^2+6t+0.5. a) how long is the ball in the air? b) when does the ball reach its maximum height? c) ...
*September 8, 2010 by prethy*

**physics**

A baseball is hit at ground level. The ball reaches its maximum height above ground level 2.6 s after being hit. Then 2.1 s after reaching its maximum height, the ball barely clears a fence that is 96.4 m from where it was hit. Assume the ground is level. (a) What maximum ...
*November 3, 2010 by tom*

**Physics**

A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.2 s after being hit. Then 2.7 s after reaching its maximum height, the ball barely clears a fence that is 81.0 m from where it was hit. Assume the ground is level. (a) What maximum ...
*October 9, 2012 by Devin*

**physics**

a ball is thrown up and reaches a maximum height of 5 m. a) what is the initial velocity of the ball? b) how long does it take for the ball to reach its maximum height? c) what is the final velocity of the ball? if i returns to where it was thrown from?
*November 29, 2012 by Isis*

**Calculus **

Spud McTator climbs his sailboat's mast while anchored. He fires his potato gun. The height of the potato above the ocean is given by: h=0.002X*2+2X=22. Where X is the horizontal distance from the keel of the boat. How far from the keel is the height of the potato a maximum? ...
*June 8, 2012 by help :)*

**Phisics**

A rocket is launched at an angle of 59.0° above the horizontal with an initial speed of 103 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. (a) ...
*September 12, 2012 by Kali*

**physics**

In order for a ski jumper to attain maximum projectile distance she must reach a velocity of 30m/s. of the runway of the takeoff ramp is 70m long, how quickly ust she accelerate?
*February 25, 2013 by Mark*

**College Physics**

Consider a rock thrown off a bridge of height 78.5 m at an angle è = 25° with respect to the horizontal as shown in Figure P4.20. The initial speed of the rock is 15.6 m/s. Find the following quantities: (a) the maximum height reached by the rock (b) the time it takes the rock...
*September 12, 2011 by HELP*

**Physics**

The equation of motion for an oscillator in vertical SHM is given by y=(0.60m)sin[(130rad/s)t]. Part A What is the amplitude of this motion? Part B What is the frequency of this motion? Part C What is the period of this motion?
*December 10, 2013 by Becca*

**Algebra II**

Help me with this, please... A ball is dropped vertically from a height of 80 meters. After each bounce, the ball reaches a maximum height equal to 60 percent of maximum height of the previous bounce. a. Write the first three terms of the sequence. Explain how you know what ...
*April 10, 2014 by Me and I*

**Physics**

How do you find the max height of a projectile given the angle and Vi? Angle = 57.0 degrees Initial V = 46 m/s
*January 4, 2009 by JO*

**Physics**

a projectile is launched in the horizontal direction. It travels 2.050 m horizontally while it falls 0.450 m vertically, and it then strikes the floor. What was the original velocity of the projectile? How long was it in the air?
*February 7, 2013 by Anonymous*

**physics**

a ball of mass 4kg is thrown vertically upwards with a velocity of 40m/s.Find a-maximum height b-height after 3 seconds c-time of flight
*March 24, 2012 by heather*

**Physics**

A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.2 s after being hit. Then 2.7 s after reaching its maximum height, the ball barely clears a fence that is 81.0 m from where it was hit. Assume the ground is level. (a) What maximum ...
*October 9, 2012 by Devin*

**Physics**

A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.2 s after being hit. Then 2.7 s after reaching its maximum height, the ball barely clears a fence that is 81.0 m from where it was hit. Assume the ground is level. (a) What maximum ...
*October 9, 2012 by Devin*

**Algebra**

A catapult launches a boulder with an upward velocity of 184 feet per second. The height of the boulder, (h), in feet after t seconds is given by the function h(t) = –16t² + 184t +20. How long does it take the boulder to reach its maximum height? What is the boulder’s maximum ...
*April 3, 2014 by Sandra*

**AP Physics**

So my question is about projectile motion. We just learned in class about the equation for finding the range: R=v^2sin(2theta)/g I understand that and I think I see where it comes from. My question is, if someone were to collect data on the projectile range for different ...
*February 19, 2013 by Sydney*

**Physics**

A soldier is tasked with measuring the muzzle velocity of a new rifle. Knowing the principles of projectile motion, he decides to perform a simple experiment at the indoor firing range. The soldier hangs a target a distance of d = 101 m from the end of the barrel. The rifle is...
*December 5, 2012 by Kevin*

**Physics**

Michael Jordan, formerly of the Chicago Bulls basketball team, has some fanatic fans. They claim that he is able to jump and remain in the air for two full seconds from launch to landing. Evaluate this claim by calculating the maximum height that such a jump would attain. For ...
*October 11, 2010 by Kelly*

**Physics**

A woman is 1.6 m tall and has a mass of 53 kg. She moves past an observer with the direction of the motion parallel to her height. The observer measures her relativistic momentum to have a magnitude of 2.6 x 1011 kg·m/s. What does the observer measure for her height?
*July 21, 2012 by Beth*

**PHYSICS**

A woman is 1.6 m tall and has a mass of 47 kg. She moves past an observer with the direction of the motion parallel to her height. The observer measures her relativistic momentum to have a magnitude of 2.2 × 1010 kg·m/s. What does the observer measure for her height?
*April 3, 2013 by please help *

**physics**

A woman is 1.6 m tall and has a mass of 47 kg. She moves past an observer with the direction of the motion parallel to her height. The observer measures her relativistic momentum to have a magnitude of 2.2 × 1010 kg·m/s. What does the observer measure for her height?
*April 4, 2013 by please help *

**physics**

Consider a rock that is thrown off a bridge of height 27 m at an angle θ = 24° with respect to the horizontal as shown in the figure above. If the initial speed the rock is thrown is 12 m/s, find the following quantities: (a) The time it takes the rock to reach its ...
*September 6, 2010 by frank*

**physics**

An object with mass 3.0 kg is attached to a spring with spring stiffness constant k = 300 N/m and is executing simple harmonic motion. When the object is 0.020 m from its equilibrium position, it is moving with a speed of 0.55 m/s. (a) Calculate the amplitude of the motion. m...
*March 7, 2012 by Nicole*

**physics**

A plane, diving with constant speed at an angle of 51.5° with the vertical, releases a projectile at an altitude of 654 m. The projectile hits the ground 6.40 s after release. (a) What is the speed of the plane? (b) How far does the projectile travel horizontally during its ...
*September 2, 2012 by gg*

**physics**

A projectile is lanched om horizontal plane. Variation of slop of trajectory of projectile with time. Where m=0 to1 and t=0 to 10. What will be the horizontal range?
*July 24, 2011 by Shivam*

**math**

The maximum, range of a projectile is directly proportional to the square of its velocity. A baseball pitcher throws a ball at 60 mph, with a maximum range of 242 ft. What is his maximum range if he throws the ball at 70 mph?
*March 8, 2011 by Jeromino*

**physics**

A projectile is fired with an initial velocity of 24 m/s at 40 degrees above the horizontal.What is the velocity of the projectile at its highest point?
*September 15, 2009 by ummi*

**physics**

a cricketer throw the ball to have maximum horizontal range of 120m.if he throws the ball vertically with same velocity what is the maximum height it can reach?
*December 24, 2012 by vidya*

**Physics **

This is a four part question, I need help with the fourth part. 1. I found the Gravitational Potential Energy of a gymnast at her maximum height above a trampoline to be 400J. 2. I found the Kinetic Energy of her just before she makes contact with the trampoline to also be ...
*November 6, 2009 by Dan*

**PHYSICS**

at the earths surface, a projectile is launched straight up at a speed of 10km/. To what height will it rise? i need some major help here please dont know where to begin on this one!
*October 22, 2007 by natali*

**physics**

A projectile is shot from the edge of a cliff 125 m above ground level with an initial speed of 105 m/s at an angle of 37.0o with the horizontal, as shown in Figure 3-39. (a) Determine the time taken by the projectile to hit point P at ground level. (b) Determine the range X ...
*April 25, 2012 by matin*

**Math**

Using h(t)=gt^2+v0t+h0, where g= -16, h0= initial height, v0= initial velocity, and t= time A rocket is fired into the air from the top of a building that is 200 feet tall. The initial velocity of the rocket is 600 feet/sec. If necessary, round answers to the nearest hundredth...
*April 14, 2012 by Brandon*

**physics**

A projectile is launched at an angle of 600. What other angle would give the same range for the projectile if we neglect air resistance?
*January 31, 2011 by Latisha*

**physics**

A projectile is launched at an angle of 600. What other angle would give the same range for the projectile if we neglect air resistance?
*April 18, 2012 by James*

**physics**

A projectile is launched at a 60 degree angle above the horizontal with an initial velocity of 35.5 m/s. What is the projectile's velocity (magnitude and direction) 1.50 s into the flight?
*March 2, 2013 by Anonymous*

**physics**

In an electric shaver, the blade moves back and forth over a distance of 2.0 mm. The motion is simple harmonic, with frequency 118 Hz. (a) Find the amplitude. mm (b) Find the maximum blade speed. m/s (c) Find the magnitude of the maximum blade acceleration. m/s2
*December 8, 2008 by johnny*

**physics**

In an electric shaver, the blade moves back and forth over a distance of 2.0 mm. The motion is simple harmonic, with frequency 118 Hz. (a) Find the amplitude. mm (b) Find the maximum blade speed. m/s (c) Find the magnitude of the maximum blade acceleration. m/s2
*December 11, 2008 by johnny*

**physics**

A stone is projected vertically upward with a speed of 30m/s from the top of a tower of height 50m neglecting air resistance. Determine the maximum height reached from the ground
*February 28, 2014 by ogboye*

**Physics**

A stone projected vertically upward with a speed of 30ms from the top of a tower of height 50m neglecting the air resistance.determine the maximum height it reach from the ground
*August 5, 2014 by Charles*

**Physical science**

A projectile spends a total of 20 seconds in the air. It reaches a peak height of 8 meters. How long does it take to reach it's peak height
*June 21, 2011 by Rosie*

**Physics**

At t = 0, a 785 g mass at rest on the end of a horizontal spring (k = 125 N/m) is struck by a hammer, which gives the mass an initial speed of 2.70 m/s. (a) Determine the period of the motion. T= .4979201367s Determine the frequency of the motion. f= 2.008354 Hz (b) Determine ...
*December 7, 2010 by Anon*

**trigonometry**

An object is attached by a string to the end of a spring. When the weight is released it starts oscillating vertically in a periodic way that can be modeled by a trigonometric function. The object's average height is −20 cm (measured from the top of the spring). It ...
*July 31, 2014 by obet*

**Physics**

An object with mass 3.0 kg is executing simple harmonic motion, attached to a spring with spring constant k =210 N/m. When the object is 0.23 m from its equilibrium position, it is moving with a speed of 0.72 m/s. (a) Calculate the amplitude of the motion. m (b) Calculate the ...
*June 12, 2014 by Garrett*

**PHYSICS**

At the Earth's surface, a projectile is launched straight up at a speed of 8.4 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth.
*March 11, 2011 by Rachel*

**Physics**

A German U2 rocket from the Second World War had a range of 300 km, reaching a maximum height of 100 km. Determine the rocket's maximum initial velocity.
*July 8, 2010 by Riss*

**Physics**

A block rides on a piston that is moving vertically with simple harmonic motion. (a) If the SHM has period 3.1 s, at what amplitude of motion will the block and piston separate? (b) If the piston has an amplitude of 9.6 cm, what is the maximum frequency for which the block and...
*February 22, 2011 by Jake*

**Physics**

A projectile, fired with unknown initial velocity, lands 20.8 s later on the side of a hill, 2900 m away horizontally and 411 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its initial velocity? (b) What...
*September 4, 2012 by Anonymous*

**Physics**

sorry to keep posting this, but I have an assignment based on these problems (same equations different numbers) due in a couple hours. A rocket is launched at an angle of 42◦ above the horizontal with an initial speed of 76 m/s. It moves for 9 s along its initial line of...
*September 6, 2010 by John*

**science/physics**

A 0.09 kg ball of dough is thrown straight up into the air with an initial speed of 5.5 m/s. (a) Find the momentum of the ball of dough at its maximum height. (b) Find the momentum of the ball of dough halfway to its maximum height on the way up.
*December 10, 2009 by brandon*

**science/physics**

A 0.09 kg ball of dough is thrown straight up into the air with an initial speed of 5.5 m/s (a) Find the momentum of the ball of dough at its maximum height. (b) Find the momentum of the ball of dough halfway to its maximum height on the way up.
*December 10, 2009 by brandon*

**Physics/Science #2**

A rock is thrown verticaly upward from ground level at time t = 0. At t = 1.65 s it passes the top of a tall tower, and 0.95 s later it reaches its maximum height. What is the height of the tower? height = _______ m First, find the initial velocity from the height of the tower...
*January 25, 2007 by TechnoBoi11*

**physics**

A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? Your response differs from the ...
*September 6, 2010 by jim*

**Physics:Projectile Motion**

A rifle is aimed horizontally at a target 50m away. The bullet hits the target 2.0cm below the aim point. A. What was the bullet's fight time? B. What was the bullet's speed as it left the barrel?
*September 23, 2008 by Erinne*

**Physics Projectile Motion**

A rifle is aimed horizontally at a target 50m away. The bullet hits the target 2.0cm below the aim point. A. What was the bullet's fight time? B. What was the bullet's speed as it left the barrel?
*September 23, 2008 by Erinne*

**COLLEGE PHYSICS**

A rocket is launched at an angle of 60.0° above the horizontal with an initial speed of 99 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile.
*September 10, 2010 by CARY*

**College Algebra**

A ball is thrown up from a twelve foot platform with an initial velocity of 112 feet/second. The formula that describes the height of the ball in terms of time is: f(t) = -16t^2+112t+12. Determine the time at which the ball reaches its maximum height. Determine the maximum ...
*August 11, 2011 by Lauren Marie*

**college physics**

using the quadratic equation on a 2 dimensional projectile motion problem... i am solving for tf and i have it worked all the way down to: -100m(tf)-100m(tf) / -10m/s^2(tf)^2 or -200m(tf) / -10m/s^2(tf)^2 is the answer 20 seconds? algebra is not my strong suit =(
*November 29, 2009 by dave*

**physics**

A)A model rocket is launched straight upward with an initial speed of 47.7 m/s. It accelerates with a constant upward acceleration of 2.02 m/s2 until its engines stop at an altitude of 157 m. What is the maximum height reached by the rocket? B)How long after lift off does the ...
*January 25, 2014 by Justin*

**Physics**

At the Earth's surface, a projectile is launched straight up at a speed of 9.9 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth. _____m
*April 29, 2014 by Joe*

**Physics**

A 0.15 kg ball of dough is thrown straight up into the air with an initial speed of 5.7 m/s. a.)Find the momentum of the ball of dough at its maximum height. b.) Find the momentum of the ball of dough halfway to its maximum height on the way up.
*December 8, 2011 by Tyler*

**physics**

If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t.
How many seconds does it take for the ball to reach its maximum height, and what is this height?
*May 22, 2011 by lee*

**physics- projectile motion**

A player passes a basketball to another player who catches it at the same level from which it was thrown. The initial speed of the ball is 7.1 m/s, and it travels a distance of 4.6 m. What was (a) the initial direction of the ball and (b) its time of flight?
*March 13, 2008 by Sugarplum*

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