Sunday

April 20, 2014

April 20, 2014

Number of results: 53,560

**physics**

a) The sign of the velocity changes after the ball is hit. That makes the CHANGE in momentum equal to M[42 -(-58)] = 0.145 kg * 100 m/s b) Impulse = (average force) x (time of contact) = (change in momentum) = 14.5 kg m/s Solve for the average force
*Friday, December 25, 2009 at 8:37pm by drwls*

**Calculus**

I am stuck on both of these questions. Would you please tell me if my reasoning is correct? 1. An object is dropped off a building. When comparing the average velocity of the object over equal time intervals, explain the difference between early time intervals and later time ...
*Thursday, April 10, 2014 at 1:19am by Sarah*

**physics**

average velocity= change in displacement/time change in displacement=finalposition-initial = 186N average speed= distance/time where distance = 3.5*pi*2r
*Thursday, September 1, 2011 at 8:22pm by bobpursley*

**physics**

A lead ball is dropped into a lake from a diving board 5.24 m above the water. It hits the water with a certain velocity and then sinks to the bottom with this same constant velocity. It reaches the bottom 4.86 s after it is dropped. (Assume the positive direction is upward...
*Monday, September 7, 2009 at 10:09pm by Nick*

**Physics**

At an air show, a jet plane has velocity components vx = 695 km/h and vy = 440 km/h at time 4.85s and vx= 933km/h and vy = 465 km/h at time 7.12 s. For this time interval, find (a) the x and y components of the plane’s average acceleration and (b) the magnitude and direction ...
*Sunday, January 22, 2012 at 9:51am by mo*

**Physics**

At an air show, a jet plane has velocity components vx = 695 km/h and vy = 440 km/h at time 4.85s and vx= 933km/h and vy = 465 km/h at time 7.12 s. For this time interval, find (a) the x and y components of the plane’s average acceleration and (b) the magnitude and direction ...
*Sunday, January 22, 2012 at 9:51am by mo*

**physics**

A car travels along a highway with a velocity of 24 m/s, west. The car exits the highway and 4.0 s later, its instantaneous velocity is 16 m/s, 45o north of west. What is the magnitude of the average acceleration of the car during the five-second interval?
*Saturday, July 17, 2010 at 11:46am by axel*

**Physics**

Can the instantaneous velocity of an object at a given time instant be greater than the average velocity over a time interval that includes the given time instant? Can it be less?
*Saturday, October 17, 2009 at 7:32pm by Nikita*

**physics**

Calculate the velocity of the body when it hits the floor. V = sqrt (2gH) = 2.8 m/s The time required needed to stop the fall in a distance d is given by (V/2)*T = d since V/2 is the average velocity during deceleration. T = 2d/V acceleration rate = V/T = V^2/(2d) = 392 m/s^2 ...
*Thursday, September 18, 2008 at 6:53pm by drwls*

**calculus**

Find the average rate of change f(x)=x^3-8x+9 a. from -3 to -2 b. from -1 to 5 c. from 5 to 9 A. what is average rate of change of f(x)=x^3-8x+9 from -3 to -2? B. what is the average rate of change of f(x)-x^3-8x+9 from -1 to 5? C. what is the average rate of change of f(x)=x^...
*Wednesday, December 12, 2012 at 8:37pm by confused--please help*

**math**

Baseball Nick throws a baseball upward with an initial velocity of 60 feet per second. What is the maximum height of the ball after Nick releases the ball? Formula for the problem - h(t)=v0t-16t^2, h(t)= the height of an object in feet, v0=an object's initial velocity in feet ...
*Saturday, April 14, 2007 at 9:20pm by Angel*

**calculus**

Find the average value of the function f(x)=8x^2-5x+6 , on the interval [3,5]. Find the value of x-coordinate at which the function assumes it's average value. what is the average value = to ? what is the x coordinate = to ? Thanks
*Saturday, December 3, 2011 at 4:06pm by li*

**physics**

1.Turner’s treadmill starts with a velocity of −2.4 m/s and speeds up at regular intervals during a half-hour workout.After 23 min, the treadmill has a velocity of −7.0 m/s. What is the average acceleration of the treadmill during this period? Answer in units of m
*Sunday, September 23, 2012 at 4:38pm by neko alice*

**physiology**

Given a Helium-Neon laser-based fiber optic Doppler probe at an angle of 60¡C with a blood vessel that registers a frequency shift of 63KHz, what is the velocity of the blood? Is this a reasonable number from a physiologic point of view when compared to the average velocity in...
*Thursday, June 16, 2011 at 11:05am by cs*

**Chemistry**

I gave you the rms speed earlier; I thought that might be easier to handle but the answer you get should be the same as the kinetic energy calculation. The average kinetic energy of a molecule is 1/2 mv^2 and the average KE of different molecules is the same at the same T. So ...
*Wednesday, January 18, 2012 at 8:27pm by DrBob222*

**Physics**

A fisher sets out to check his fishing nets and heads 15 km/h [N] for 0.20 h. After stopping for 0.50h, he travels at 12 km/h [E] for 0.10 h to get to the next set of fishing nets. a) What is the fisher's displacement to get to the first set of nets? ( I got 3 km [N]) b) What ...
*Tuesday, September 14, 2010 at 9:42pm by Emily*

**Physics**

A lump of clay with a mass of 5.0 ! 10-2 kg is thrown toward a wall with a velocity of 3.0 m/s. The clay bounces off the wall with a velocity of #0.5 m/s. What is the impulse on the clay? If the clay in the previous problem impacted the wall for 5.0 ms, what was the average ...
*Thursday, December 8, 2011 at 11:03pm by HELP*

**physics**

A baseball mass of 150.0g, is thrown by the pitcher toward the home plate with a velocity of 45.0 m/s. it is hit back at the pitcher with a velocity of 60.0 m/s, what is the average force on the bat, if the ball and bat are in contat for a time of 100.0 ms? What is the change ...
*Tuesday, March 1, 2011 at 12:16pm by candice*

**Physics**

At the highest point of the jump, the velocity will have only a horizontal component: 11.1 m/s. Since that component is constant, the vertical component when leaving the ramp was sqrt[(17.9)^2 - (11.1)^2] = 14.0 m/s The initial vertical velocity component, Vyo, can be used to ...
*Saturday, November 1, 2008 at 12:41pm by drwls*

**physics**

A bicycle traveled 150 meters west from point A to point B. Then it took the same route and came back to point A. It took a total of 2 minutes for the bicycle to return to point A. What is the average speed and average velocity of the bicycle?
*Thursday, January 24, 2013 at 4:59pm by frank*

**Calculus**

all questions from a) to d) are done the same way I will do c) when t = 2, y = 44(2) - 16(2^2) = 24 when t = 2.05 , y = 44(2.05) - 16(2.05)^2 = 22.96 average velocity = (22.96 - 24)/(2.05 - 2) = -20.8 I will leave the conclusion for e) also up to you.
*Monday, January 17, 2011 at 9:08pm by Reiny*

**physics**

a dog runs from point a to b to c in 4.00s. find the dog's average velocity over this 4.00 second interval find the dog's average speed over this 4.00s intervals I can't remember the formula off hand. Thanks for your help in advance.
*Tuesday, September 17, 2013 at 10:42pm by deb*

**Calculus**

I have no idea how to do this question. Would be appreciated if someone help =) The velocity of a car is given by v(t)=60(1-[0.7]^t), where v is measured in m/s and t is measured in s. Determine the following: a)What is the acceleration function? b) What is the accerlation at ...
*Tuesday, March 6, 2012 at 6:31pm by Jessica*

**Physics**

A 6090kg space probe mobing nose-first toward Jupiter at 105m/s relative to the Sun, fires its rocket engine ejecting 80 kg of exhaust at a speed of 253 m/s relative to the space probe. What is the final velocity of the probe? I should have gotten 108m/s Can yoou show me the ...
*Friday, February 2, 2007 at 3:59pm by Tammy*

**physics**

First convert 60 mph to 88 ft/s. During braking, the average velocity will be 1/2 * 88 = 44 ft/s The time required to stop will be (88 ft/s)/15 ft/s^2 = 5.87 s Stopping distance = average speed x time
*Thursday, January 20, 2011 at 10:31pm by drwls*

**physics**

Considering that the perigee velocity must be less than 24,403 mph, if it were 24,402 and the companion apogee velocity very small, say 1 mph, the average of the two would be far less than 19,600 mph, indicating that it is impossible.
*Wednesday, September 7, 2011 at 11:10pm by tchrwill*

**PoE**

Turner’s treadmill starts with a velocity of −1.9 m/s and speeds up at regular intervals during a half-hour workout.After 36 min, the treadmill has a velocity of −7.6 m/s. What is the average acceleration of the treadmill during this period? Answer in units of m/s2
*Sunday, October 7, 2012 at 6:48pm by Sonia*

**physics**

Turner’s treadmill starts with a velocity of −2.9 m/s and speeds up at regular intervals during a half-hour workout.After 23 min, the treadmill has a velocity of −7.9 m/s. What is the average acceleration of the treadmill during this period? Answer in units of m/s2
*Wednesday, September 25, 2013 at 4:59pm by Anonymous*

**physics**

avg speed= distance/time change km to meters, min to seconds. Velocity is (final position-initial position)/time. Because his final position and intial position are the same, his average velocity is zero.
*Friday, September 11, 2009 at 4:52pm by bobpursley*

**Physics**

B) The velocity at time t is the derivative of the x(t) function. Therefore V(t) = 5 + 2.25 t^2. You can use that formula for the exact instantaneous velocity. At t=4 s, the instantaneous velocity is 5 + 2.25*16 = 41 m/s. They are NOT asking you to use differential calculus, ...
*Sunday, September 2, 2007 at 7:46pm by drwls*

**physics**

Average acceleration = (velocity change)/(time interval)
*Wednesday, July 9, 2008 at 8:35pm by drwls*

**Physics**

so would the average speed and velocity be the same thing
*Tuesday, February 9, 2010 at 9:34pm by jake*

**Physics **

How do you determine the average velocity on a position-time graph?
*Monday, December 13, 2010 at 6:38pm by pooja *

**Physics**

Average velocity of what going from where to where? We are not mind readers here.
*Sunday, January 30, 2011 at 7:45pm by drwls*

**physics**

Multiply average velocity (25 m/s) by the time interval (2 s).
*Sunday, October 9, 2011 at 3:07pm by drwls*

**physics**

you drive a car for 2.0 h at 40km/h, then for another 2.0 h at 60km/h. what is your average velocity?
*Saturday, February 4, 2012 at 2:38pm by erika*

**physics**

(average velocity)*(time) = 23.9 m/s*12 s = 286.8 m
*Wednesday, May 29, 2013 at 6:07pm by drwls*

**chemistry**

1)How can you determine average velocity from displacement time graph?
*Sunday, June 23, 2013 at 12:56pm by edward*

**physics**

velocity changed by 20m/s in 10s. So that means an average acceleration of (20m/s)/(10s) = (20/10) m/s^2 = 2 m/s^2 That is, every second, the velocity increased by 2 m/s, thus going from 0 to 20 in 10 seconds.
*Sunday, March 23, 2014 at 11:31am by Steve*

**physics**

a 4 kg model rocket is launched, shooting 50 kg of burned fuel from its exhaust at an average velocity of 625 m/s. What is the velocity of the rocket after the fuel has burned.? Ignore effects of gravity and air resistance.
*Monday, January 31, 2011 at 3:13pm by collin*

**Physics**

Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?
*Thursday, September 22, 2011 at 9:16pm by Jonoathan*

**Physics**

Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?
*Saturday, September 24, 2011 at 11:07pm by Jonathan *

**math**

Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?
*Sunday, September 25, 2011 at 5:52pm by Anonymous*

**Physics**

Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?
*Monday, September 26, 2011 at 6:54pm by alex*

**physics**

Emily takes a trip, driving with a constant velocity of 89.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 70.8 km/h to the north, how long does the trip take?
*Wednesday, September 12, 2012 at 6:53pm by ashley*

**physics**

Emily takes a trip, driving with a constant velocity of 81.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 72.8 km/h to the north, how long does the trip take?
*Sunday, August 28, 2011 at 9:06pm by steph*

**Physics**

please check if these are right 1. Which of the following is the equation for average velocity? a. Vavg=delta x/delta t b. Vavg=delta t/delta x c. Vavg=delta x *delta t d. Vavg=V1-Vf/2 i picked A 2. Suppose you are given a position versus time graph. the slope of a line drawn ...
*Friday, January 30, 2009 at 11:48am by y912f*

**physics**

A runner dashes from the starting line (x = 0) to a point 127 m away and then turns around and runs to a point 38 m away from the starting point in 13 seconds. To the nearest tenth of a m/s what is the average speed? What is the runner's average velocity in the previous problem?
*Friday, February 7, 2014 at 4:58pm by Annita*

**physics**

The velocity will increase by 80 m/s. Add that to the original 10 m/s for the final speed of 90 m/s. The average speed is (1/2)(10 + 90) = 50 m/s Distance travelled = 8s * (average speed) = 8*50 m/s = 400 m
*Monday, February 28, 2011 at 5:22am by drwls*

**physics**

does the slope of a distance vs. time graph show the average velocity or the instaneous velocity I'm asked the question and don't know which one. I believe that it would be the instaneous value because the slope is refering to one point on the graph... not sure though
*Wednesday, August 12, 2009 at 11:28am by physics*

**Science/math**

Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?
*Saturday, September 24, 2011 at 2:53pm by Jonathan*

**physics**

A lead ball is dropped in a lake from a diving board 6.28 m above the water. It hits the water with a certain velocity and then sinks to the bottom with the same constant velocity. It reaches the bottom 5.16 s after it is dropped. (a) How deep is the lake? (b) What is the ...
*Saturday, October 9, 2010 at 12:53am by monnie*

**PHYSICS**

A lead ball is dropped in a lake from a diving board 5.89 m above the water. It hits the water with a certain velocity and then sinks to the bottom with the same constant velocity. It reaches the bottom 4.29 s after it is dropped. (a) How deep is the lake? (b) What is the ...
*Thursday, September 12, 2013 at 4:40pm by kristy*

**physics**

A lead ball is dropped in a lake from a diving board 5.89 m above the water. It hits the water with a certain velocity and then sinks to the bottom with the same constant velocity. It reaches the bottom 4.29 s after it is dropped. (a) How deep is the lake? (b) What is the ...
*Thursday, September 12, 2013 at 7:05pm by kristy*

**Physics**

Between 5.4 and 9.7s, the particle completes 4.3/12.0 = 35.8% of a revolution, or 129 degrees of travel around the circle. Displacement during that interval is 2R*sin(129/2)= 15.52 m Average velocity during the interval is that displacement divided by 4.3s. For instantaneous ...
*Tuesday, September 22, 2009 at 1:24am by drwls*

**Please Help, Physics**

1 A runner dashes from the starting line (x = 0) to a point 130 m away and then turns around and runs to a point 11 m away from the starting point in 21 seconds. To the nearest tenth of a m/s what is the average speed? 2 What is the runner's average velocity in the previous ...
*Wednesday, September 2, 2009 at 9:58pm by Sari*

**social studies**

Given a Helium-Neon laser-based fiber optic Doppler probe at an angle of 60¡C with a blood vessel that registers a frequency shift of 63KHz, what is the velocity of the blood? Is this a reasonable number from a physiologic point of view when compared to the average velocity in...
*Wednesday, June 15, 2011 at 11:50pm by CS*

**physics**

bobpursley, No, the question actually says it travels 0.45h in the last second. So its 45% of the total height I believe. Unless it was a typo the average velocity is unknown. The only information known is its initial velocity (at the top of the fall, not only the last second...
*Thursday, September 3, 2009 at 6:06pm by Ryan*

**Physics**

An electronic motor is revolving at 2000rpm. After 3sec, it is moving at 150rpm. Determine the angular acceleration. What is angular momentum of the electric motor if the rotational inertia is 18.kg.square meter in initial velocity? In final velocity? What is the average ...
*Sunday, December 16, 2012 at 11:05am by Bob*

**Physics**

I am given a velocity versus time graph for a runner. For it, I had to figure out the average velocity for the entire 16 s interval (for this, I got 2 m/s). Now they want me to find the displacement of the runner in the first 15.4 s. I know that it must be somewhere around 30...
*Tuesday, October 16, 2007 at 4:30pm by Lindsay*

**physics**

Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and ...
*Friday, January 27, 2012 at 11:30am by Nakiya*

**Physics**

The function ax(t) describes the acceleration of a particle moving along the x-axis. At time t=0, the particle is located at the position x0 and the velocity of the particle is zero. ax(t)=a0e−bt The numerical values of all parameters are listed below: x0=980 m a0=500 ...
*Saturday, September 1, 2012 at 12:46pm by Natalie*

**Physics**

Please help! I dont know how to solve these problems! 1 A runner dashes from the starting line (x = 0) to a point 130 m away and then turns around and runs to a point 11 m away from the starting point in 21 seconds. To the nearest tenth of a m/s what is the average speed? 2 ...
*Wednesday, September 2, 2009 at 8:17pm by Yulka*

**Calc**

If a ball is thrown into the air with a velocity of 30m/s, its height in metres after t seconds is given by y=30t-4.9t^2 Fing the average velocity for the time period beginning when t=2 and lasting 1second. I did V(1)=lim h->0 [[30(1+h)-4.9(1+h)^2]-[30(1)-4.9(1)^2]]/h After...
*Monday, October 5, 2009 at 11:08pm by sh*

**math**

The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s = 4 sin ¦Ðt + 3 cos ¦Ðt, where t is measured in seconds. (a)Find the average velocity during each time period. (i) [1, 2] (ii) [1, 1.1] (iii) [1, 1....
*Saturday, September 3, 2011 at 1:48am by yanxin*

**math-average**

What is SUM AVERAGE? The professor mentioned that the exam average was 58 [out of 100] and sum average was 144
*Thursday, March 6, 2008 at 3:00pm by see*

**Physics**

A rock is dropped of the side of a bridge and hits the water below 4s later. a. What was the rock’s velocity when it hit the water? b. What was the rock’s average velocity as it fell? c. What is the height of the bridge above the water?
*Tuesday, April 6, 2010 at 12:19am by Jackie*

**english**

1. He is of average height. 2. He is around average height. 3. He is a little below average height. 4. He is over average height. 5. He is of much more average height. 6. he is a little average in height. 7. He is more average in height. (Are they all grammatical?)
*Wednesday, November 14, 2012 at 3:52pm by rfvv*

**Physics**

If the puck strikes the goalie's pads and stops in a distance of 4.14 cm, what average force is exerted on the pads? Answer in units of N. This is part three of three parts. 1st Part: A player strikes a hockey puck giving it a velocity of 39.486 m/s. The puck slides across the...
*Sunday, November 25, 2012 at 4:02pm by Alexandra*

**calculus**

average value is the integral divided by the interval length. Thinking in terms of area, the integral is the total area, and a rectangle with that same area would have width of the interval, height the average value Int(15 - 15e^(-t/2))[0,4] = 15t + 30e^(-t/2)[0,4] = (15*4 + ...
*Wednesday, November 23, 2011 at 11:22am by Steve*

**calculus**

If a ball is thrown vertically upward with a velocity of 160 ft/s, then its height after t seconds is s = 160t - 16t^2 What is the velocity of the ball when it is 96 ft above the ground on its way up?
*Friday, November 14, 2008 at 1:07am by fred*

**physics**

if u have swam one lap in a swimming pool, that means from one end to the other and back. In 3.5 h, a swimmer makes exactly 60 laps in the pool, that is 40 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the swimmer's average ...
*Tuesday, January 14, 2014 at 12:41pm by Bre *

**calculus**

a particle moves along the x-axis in such a way that its acceleration at any time t is given by a(t)= 6t - 18. At time t = 0, the velocity v(t) = 24. and at time t = 1, the position x(t) = 20 i have to find the expression for the velocity and what values t is at rest
*Thursday, December 9, 2010 at 12:29am by allan*

**Calculus**

h(6) = 100+45(6) - 5(36) = 190 m Wow, this person was able to throw a rock upwards 90 m, the height of roughly a football field ?? velocity = h' (t) = 45 - 10t when t=6 velocity = 45 - 60 = -15 m/sec
*Friday, January 25, 2013 at 6:18pm by Reiny*

**Physics**

I believe you stated the problem incorrectly. It does not accelerate FROM 96.56 km/h. That is the FINAL velocity after 4.3 seconds. It accelerates TO 96.56 km/h The average speed during acceleration at a constant rate (from a standing start) is half the final velocity.
*Wednesday, February 13, 2013 at 11:04pm by drwls*

**Physics**

Why is The average velocity after pushing V = 2*(16.3m/2.3s) Where did u get the 2 from?
*Tuesday, September 19, 2006 at 11:25pm by Stan*

**math**

How can i find the average Velocity and speed for a position time graph*
*Tuesday, February 9, 2010 at 9:35pm by jake*

**physics**

average velocity= 18m/s time= distance/avg veloicity
*Wednesday, November 17, 2010 at 12:55pm by bobpursley*

**science**

What is the average velocity of the argon atoms in the gas phase at 75°F?
*Wednesday, May 18, 2011 at 5:31pm by Mike*

**Science**

What is the question? Highest possible average velocity in SHM interval of T/4?
*Tuesday, December 20, 2011 at 8:44am by drwls*

**physics**

(B) since the ball ended up where it started, its average velocity was 0
*Thursday, September 5, 2013 at 2:22am by Steve*

**science ( physics)**

hello, i am having trouble with this problem. Calculate the average force of friction acting on a wood block as it is propelled along the floor by an elastic band ? my solution and my ideas: What does it mean by average froce of friction? I first weighed the peice of wood to ...
*Wednesday, May 30, 2007 at 7:44pm by charlie*

**math**

The height has been given in terms of t (in seconds) as: height=y(t)=11t-1.86t² To evaluate the average velocity in a given time interval [t1,t2], you would calculate: (y(t2)-y(t1))/(t2-t1) where y(t2)=height at t=t2, and y(t1)=height at t=t1. For example, for the ...
*Saturday, August 28, 2010 at 6:33pm by MathMate*

**Calculus**

An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(1+t^2),t≥0. Determine the maximum and minimum velocities on the interval 1≤x≤4. The answer says min. velocity is 0m/s but has no maximum?
*Saturday, March 3, 2012 at 10:00pm by Jake*

**Calc I**

" I know that instantaneous velocity is calculated as s(a+h)-s(a)/h ...." ============================= Well sort of. The limit of that expression as s goes to zero is the instantaneous velocity. It is also the slope of your curve at t = 5. However the expression as you wrote ...
*Thursday, September 11, 2008 at 5:31pm by Damon*

**Maths and Physics**

I wonder what leave the Earth means. If it means to escape the normally inevitable return to Earth, the normal way to find this is to Integrate the potenial energy from Earth to infintity. I am not certain you have had calculus. NeededEnergy= INT GMe/r dr from r=re to ...
*Tuesday, April 19, 2011 at 10:19am by bobpursley*

**calculus help check and help**

a) calculate lim t->infinity (v. answer: mg/c ----->what is the meaning of this limit ============================== It is the "terminal velocity" (Google that) which is the speed where the drag force equals the weight. One uses a parachute so that one's terminal ...
*Wednesday, April 16, 2014 at 5:01pm by Damon*

**Calculating Average Atomicc Mass**

the terms"average atomic mass is............ Average,and so is calculate different from a "normal" Average?
*Saturday, September 8, 2007 at 11:57pm by asiya*

**physics**

A man is driving his car ata velocity of 100km/h on a straight road. H e sees a traffic jam at a distance and slows down to 12.5m/s in 3.0s. What is the average acceleration of the car? pls help. I know that the formula for average acceleration is V2-V1 divided by T2-T1 but ...
*Wednesday, October 12, 2011 at 9:41pm by ted*

**calculus 1**

particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the velocity and speed when t = 6. (Round your answers to two decimal places.) f(t) = t−1 − t velocity m/s speed m/s
*Thursday, January 31, 2013 at 5:25pm by monic*

**calculus I**

the height (in meters) of a projectile shot vertically upward from a point 2 m above ground level with initial velocity of 24.5 m/s is h=2+24.5t-4.9t^2 after t seconds. Find the velocity after 2s and 4 s?
*Monday, April 7, 2014 at 1:13am by Please help mee*

**math(mechanics)**

Unusual wording of this question When they ask for "average" velocity and acceleration, usually there is a time interval involved. In your case , we are given t = 4, a specific time. I would expect to be asked for the "instantaneous" velocity and acceleration method: if s = t^...
*Wednesday, April 18, 2012 at 4:51am by Reiny*

**physics**

The acceleration should have units of m/s^2 so I will assume it is 0.6 m/s^2 The average velocity during the period is 500/10 = 50 m/s = (V2 + V1)/2, so V2 + V1 = 100 You also know that V2 - V1 = a * 10s = 6 m/s Therefore 2 V2 = 106 V2 = 53 V1 = 47 is the initial velocity
*Thursday, February 10, 2011 at 6:25am by drwls*

**Math**

The location of an object on the x-axis at time t seconds is given by x(t)= a + mt, where a, m are constants. (a) Where is the object located at time t=1? x(1)= a+m(1) = a+m (b) What is the average velocity of the object between 1 and 2 seconds? x(2)-x(1)/(2-1) a+2m-(a+m)=m (c...
*Monday, January 18, 2010 at 6:43pm by SC*

**physics**

a) It will rise until the vertical velocity component equals zero. If we call that time T, gT = Vo sin 58 Maximum height = T * average vertical velocity = (1/2)*[V sin 58]^2 /g b) 2*T c) 2T*Vx = 2*T*Vo cos 58
*Sunday, February 14, 2010 at 5:08pm by drwls*

**Physics**

frequency f = 2 rev/s angular velocity = 2•π•f = 4•π rad/s (a) Velocity vector at P = (1.25x4x3.14)j = 15.7 j, where j is unit vector along positive y axis. Also velocity vector of the particle at R = -15.7i, where i is unit vector along positive x direction. As the...
*Friday, May 25, 2012 at 2:56pm by Elena*

**Physics**

An athlete springs a circular 400.0 m track in 50.0 s. Asume he runs a constant speed. a. What is his speed over the entire course? b. What is the magnitude of his instantaneous velocity at any point along the circuit? c. If he starts facing west and runs counterclockwise, ...
*Monday, September 17, 2012 at 7:43pm by Alex*

**Calculus**

To get the max velocity, first, differentiate the velocity equation with respect to time. Then equate to zero: dv/dt = 3 - 0.4t 0 = 3 - 0.4t 0.4t = 3 t = 7.5 Substitute to the original equation: v = 3t-0.2t^2 v = 3(7.5) - 0.2(7.5)^2 v = ? Or you may also want to plot the ...
*Monday, August 19, 2013 at 2:30am by Jai*

**physics**

If instead, the swimmer makes 30.5 laps in the same pool in 3 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed. pool is 30 m long please answer in km
*Friday, January 27, 2012 at 1:15pm by lauren*

**physics**

If instead, the swimmer makes 30.5 laps in the same pool in 3 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed. pool is 30 m long please answer in km
*Friday, January 27, 2012 at 1:15pm by lauren*

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