Tuesday

May 3, 2016
**Physics **

a spring extends by 10 cm when a mass of 100g is attached to it. what is the spring constant?
*Wednesday, January 27, 2016 by Rose *

**Physics**

A small rectangular ferry boat is 3.87 m wide and 5.81 m long. When a loaded truck pulls onto it, the boat sink an additional 4.31 cm into the river. What is the weight of the truck? The acceleration of gravity is 9.8 m/s^2. Answer in units of kN.
*Wednesday, January 27, 2016 by Luma*

**Physics**

A 1.8 kg rectangular air mattress is 2.46 m long, 1.23 m wide, and 0.189 m thick. What mass can it support in water before sinking? Answer in units of kg.
*Wednesday, January 27, 2016 by Luma*

**Physics**

A piece of metal weighs 51.8 N in air, 37.2 N in water, and 42.6 N in an unknown liquid. Find the density of the metal. Answer in units of kg/m^3 Find the density of the unknown liquid. Answer in units of kg/m^3
*Wednesday, January 27, 2016 by Luma*

**Physics**

A dense plastic toy of mass 1.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
*Wednesday, January 27, 2016 by Luma*

**Physics**

A rectangular barge 6 m long and 3 m wide float in fresh water. Water density is 1000 kg/m^3 horse? Answer in units of m. If the barge can only be pushed 5.34722 cm deeper into the water before water overflows to sink it, how many 350 kg horses can it carry?
*Wednesday, January 27, 2016 by Luma*

**Physics**

A floating ball normally weighs 7 N. The acceleration of gravity is 9.8 m/s^2. What is the size of the buoyant force that acts on it? Answer in units of N.
*Wednesday, January 27, 2016 by Luma*

**PHYSICS**

A UNIFORM METER RULE IS PIVOTED AT P IN 80cm mark on the meter rule force 0.2 And 0.8N Are Applied At M The 60Cm Mark And Q The 90Cm Mark.If The Rule Is In Equilibrium .Find The Mass Of The Rule.Take g=10ms-2
*Wednesday, January 27, 2016 by PRINCE*

**PHYSICS**

A BODY OF 50N Rest On A Smooth Plane Incline At 30 Degree To The Horizontal Which Force Applied Parallel To The Plane Will Keep The Body In Equilibrium
*Wednesday, January 27, 2016 by PRINCE*

**Physics**

A bullet fired vertically upwards reaches a height of 500m. [g=9.8m/s2]. What is its initial velocity?
*Wednesday, January 27, 2016 by Anonymous*

**physics**

an operating 100-watt lamp is connected to a 120-volt outlet. what is the total energy used by the lamp in 60. seconds
*Wednesday, January 27, 2016 by sean *

**Physics **

A 6.80 x 10^4 kg space shuttle moving at 7.90 x 10^4 m/s reenters the earth's atmosphere 80.0 km above the earth's surface. What is the shuttle's total mechanical energy with respect to earth's surface? I know the answer is E= 2.173 x 10^12J But I don't ...
*Wednesday, January 27, 2016 by Danny*

**physics**

a billiard ball rolling across a table at 1.50m/s makes a head on collision with an identical ball. find the speed of each ball after the collision;when the ball is at rest;when the 2nd ball ]is moving towards the first at the speed of 1.0m/s; when the second ball is moving ...
*Wednesday, January 27, 2016 by raquel*

**PHYSICS**

PLEASE POST MY ANSWER
*Wednesday, January 27, 2016 by PRINCE*

**PHYSICS**

A BLOCK OF WOOD REST ON AN INCLINE PLANE AND THE COEFFICIENT OF FRICTION BETWEEN THE BLOCK AND THE PLANE IS KNOWN TO BE 0.31 At What Angle Must The Plane Be Inclined To The Horizontal So That The Block Begins To Move Down The Plane
*Wednesday, January 27, 2016 by PRINCE*

**PHYSICS**

A CAR TRAVELLING AT 30M/S Overcome A FrictionAlly Resistance Of 100N While Moving.What Is The Power Of The Engine(Take 1 Hp=3/4 Kw)
*Wednesday, January 27, 2016 by PRINCE*

**Physics**

Two large parallel plates are separated by a small gap of distance 2 mm. See figure below. A fluid with dynamic viscosity µ = 10-3 Pa.s fills the gap between the plates. The surface area of each side of the plates is 2 m2. The top plate has a velocity 2.0 m/s in the x-...
*Wednesday, January 27, 2016 by Jeremy*

**Physics**

W.K.T, Magnetic Force qvB=mv^2/r ... n we know how to prove it too.... But how to show that the radius of curvature of the circular path is proportional to the linear momentum of the charge ?
*Wednesday, January 27, 2016 by Minho*

**Physics **

Determination of the boiling point of 0.01m solution of aluminum chloride and barium chloride and sodium chloride?
*Tuesday, January 26, 2016 by Rahul ude*

**Physics**

A pilot flies out of Cleveland and sets his compass due North. He maintains an airspeed of 250 km/hr. After 30 minutes he finds that the plane is 200 km north and 40 km west of the starting point. What is the velocity of the wind? I've made my triangle and found the ...
*Tuesday, January 26, 2016 by Erin*

**Physics**

A river flows at 6min/s and a boat can move at 4min/s relative to the water.If the boat heads perpendicular to the bank find the velocity relative to the ground.
*Tuesday, January 26, 2016 by Rona*

**Physics**

An 1750 kg weather satellite moves in a circular orbit with a gravitational potential energy of 1.69 x 10^10 J. At it's location, free-fall acceleration is only 6.44 m/s^2. How high above Earth's surface is the satellite?
*Tuesday, January 26, 2016 by Selena*

**Physics**

the pressure at a point below a point below the surface of the sea is caused by both the height of the water above that and the air pressure on the surface of the sea. if the diver reaches a depth of 20m below the surface on the surface of the sea Calculate The total pressure ...
*Tuesday, January 26, 2016 by Joe*

**physics**

C1=3.00uF and Vab = 120V. The charge on capacitor C1 is 150 uC. Calculate the voltage across the other two capacitors.
*Tuesday, January 26, 2016 by chyenne*

**Physics**

An airplane flying horizontally 1000 meters above the ground at 200 km per hr drops a bomb on a target on the ground. Determine the acute angle between the vertical and the line joning the airplaod and target at the instant when the bomb is released.
*Tuesday, January 26, 2016 by Angel*

**physics**

A capacitor has a capacitance of 7.28uF. What amount of excess charge must be placed on each of its plates to make the potential difference between the plates equal to 25.0V?
*Tuesday, January 26, 2016 by van*

**Physics**

Please help me. I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. ...
*Tuesday, January 26, 2016 by PhysicsQuestions- repost because of no response*

**Physics**

A person wants to launch a water balloon and hit the top of a tower, 50.0 meters away. The water balloon launcher is angled at 25 degrees. The water balloon leaves the launcher at 68 m/s. If the balloon hits the top of the tower, how high was the tower?
*Tuesday, January 26, 2016 by Drew*

**Physics**

A body initially at distance given an acceleration of 12/s2 (squared2 ). Find the velocity after it travelled 205. Q2. A body moving in linear motion start with an initial acceleration after 205 was 12m/s2. What's the velocity at this instance?
*Tuesday, January 26, 2016 by Dorothy*

**Physics**

Two trains are moving toward each other with speeds of 23 mph and 37 mph. How far apart are they before they pass each other? A. 60 miles B. 30 miles C. 6 miles D. 3 miles E. 2 miles F. 1 mile
*Tuesday, January 26, 2016 by Sandy East Ward*

**physics**

A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going from her eye to her ...
*Tuesday, January 26, 2016 by tommy*

**physics**

(a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates ...
*Tuesday, January 26, 2016 by tommy*

**physics**

(a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates ...
*Tuesday, January 26, 2016 by tom*

**PHYSICS**

What reaction occurs between hydrogen and helium which gives the heat and of the sun
*Tuesday, January 26, 2016 by STEVIUM*

**Physics**

I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first ...
*Tuesday, January 26, 2016 by Physics*

**physics**

(a)The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates at a constant rate up to their maximum velocity, which is maintained for the remainder of the race, no matter how long it...
*Tuesday, January 26, 2016 by tom*

**Physics**

i41 tinypic com/2qna74k png (add the periods) For the vectors in the figure, with a = 6.4, b = 2.5 and c = 6.87. Calculate a(dot)b calculate a(dot)c calculate b(dot)c I got 0 for a(dot)b but the same method (ac*cos(theta)) does not work for the other two, please help.
*Tuesday, January 26, 2016 by John brown*

**Physics**

What is the use of MODEM at the transmitting end?
*Tuesday, January 26, 2016 by Minhye*

**Physics**

What is Analog Pulse Modulation ?
*Tuesday, January 26, 2016 by Minhye*

**science(physics)**

the no of wave in 6cm of vacum is same as that of no of wave in xcm of medium refractive index of given medium is 3/2 find the value of x
*Tuesday, January 26, 2016 by Anonymous*

**physics**

the no of wave in 6cm of vacum is same as that of no of wave in xcm of medium is 3/2 find the value of x
*Tuesday, January 26, 2016 by rani*

**Marble hall**

Is it possible to start pure maths and physics at college ?
*Tuesday, January 26, 2016 by blackey*

**physics**

A bus of mass 2500kg goes round a corner of radius 50m at a speed of 5m/s. what force is needed for the bus to go round the corner?
*Tuesday, January 26, 2016 by Physics*

**Physics**

A shaft is turning at 71.6rad/s at time zero. Thereafter, its angular acceleration is given by α = –10.8rad/s2 – 4.42 t rad/s3 where t is the elapsed time. Calculate its angular speed at t = 2.73s. and How far does it turn in these 2.73s
*Tuesday, January 26, 2016 by Annie*

**Physics**

Wat direction will the Electric Field Lines be in a parallel plate capacitor containing a dielectric ?
*Tuesday, January 26, 2016 by Minhye*

**Physics**

A merry-go-round is a common piece of playground equipment. A 6.42m diameter merry-go-round with a mass of 648.0kg is spinning at 39.4rpm. John runs tangent to the merry-go-round at 6.36m/s, in the same direction that it is turning, and jumps onto the outer edge. John's ...
*Tuesday, January 26, 2016 by Ken*

**Physics**

A tennis ball, starting from rest, rolls down a hill. At the end of the hill the ball becomes airborne, leaving at an angle of 35° with respect to the ground. Treat the ball as a thin walled spherical shell (I=2/3 mr^2 )and determine the range x it travels if it starts at ...
*Tuesday, January 26, 2016 by Tim*

**Physics**

A uniform 160 N ladder rests against a perfectly smooth wall, making a 70 degree angle with the wall (ladder is 7 m long). (a) find the normal forces that the wall and the floor exert on the ladder. B) what is the friction force on the ladder at the floor? I tried to solve the...
*Tuesday, January 26, 2016 by Adolfo*

**physics**

When a load of 1(10)^6 N is placed on a ship, the ship only sinks 2.5 cm into the ocean (sea water). Estimate the cross-sectional area of the ship at water level.
*Monday, January 25, 2016 by luma*

**physics**

Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 50 cm diameter styrofoam sphere in water? (Assume the volume of the mass is negligible compared to that of the sphere.) V sphere = r^34/3 pie
*Monday, January 25, 2016 by luma*

**physics**

A 10 cm by 10 cm by 10 cm wood block with a density of 700 kg/m^3 floats in water. a. What is the distance from the top of the block to the water if the water is fresh? b. If it's seawater?
*Monday, January 25, 2016 by luma*

**physics**

A cargo barge is loaded in a saltwater harbor for a trip up a freshwater river. If the rectangular barge is 3 m by 20 m and sits 0.8 m deep in the harbor, how deep will it sit in the river?
*Monday, January 25, 2016 by luma*

**Physics**

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +0.8 m/s and ax = +0.9 m/s2. The y components of the puck's initial velocity and acceleration are ...
*Monday, January 25, 2016 by Adriana*

**physics**

Dolphins can hear ultrasound with frequencies up to 280 kHz. What is the speed of sound in water if the wavelength of ultrasound with a frequency of 2.80 × 10^5 Hz is 0.510 cm? How long would it take this sound wave to travel to a dolphin 3.00 km away?
*Monday, January 25, 2016 by sam*

**physics**

A ship anchored at sea is rocked by waves whose crests are 21 m apart. The waves travel at 5.6 m/s. How often do the wave crests reach the ship?
*Monday, January 25, 2016 by sam*

**physics**

A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going from her eye to her ...
*Monday, January 25, 2016 by tom*

**Physics**

A 1.5 tall student throws a baseball with a horizontal component of velocity of 25m/s. It takes 3.00s to come back to its original height. d. how far did the ball travel horizontally? e. What is the initial velocity in the y-direction? f.At what angle is the baseball thrown?
*Monday, January 25, 2016 by Emely*

**Physics**

Two equal points charges of +3.00 X 10-6C are placed 0.200m apart. What are the magnitude and direction of the force each charge exerts on the other?
*Monday, January 25, 2016 by van*

**physics**

A 1200kg car moves along a horizontal road at speed v0=23.3m/s,the road is wet, so the static friction coefficient between the road and the tires is only µs=0.209 and the kinetic friction coefficient is even lower µk=0.1463. The acceleration due to gravity is 9.8m/...
*Monday, January 25, 2016 by Alex*

**Physics**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 63 m/s and an angle of 42°. A cannonball that was accidentally dropped hits the moat below in 1.1 s. How far from the castle wall does the cannonball hit the ...
*Monday, January 25, 2016 by Needs help!*

**Physics**

A 0.0475 kg ice cube at −30.0°C is placed in 0.577 kg of 35.0°C water in a very well insulated container. The latent heat of fusion of water is 334 kJ/kg, the specific heat of ice is 2092 J/(kg · K), and the specific heat of water is 4184 J/(kg · K...
*Monday, January 25, 2016 by Art*

**physics**

a man holds a child on his shoulders while watching a football match. How much work has he done if the game lasts for 2 hours
*Monday, January 25, 2016 by divine*

**Physics**

(a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates ...
*Monday, January 25, 2016 by Tom*

**Physics**

(a) A magazine article states that cheetahs are the fastest sprinters in the animal world and that a cheetah was observed to accelerate from rest to 70 kilometers per hour in 2 seconds. What average acceleration in meters per second squared does this require? (b) The article ...
*Monday, January 25, 2016 by Tom*

**physics**

an object takes 0.35 seconds to hit the floor, what height did it fall from? is the way to calculate it h = gt^2 / 2 so would it be = h = .5 * 9.8 * 0.35^2
*Monday, January 25, 2016 by james*

**Physics**

A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going from her eye to her ...
*Monday, January 25, 2016 by Tom*

**Physics**

is the mechanical energy of a teflon coated block sliding down a rough incline remaining constant?
*Monday, January 25, 2016 by Marie*

**Physics**

A faulty celcius thermometer read 0.7 degree celcius at the melting point of pure ice and 99.5 at the boiling point of water at normal pressure. Calculate the correct temperature when it reads 30 degree celcius. At what temperature will its reading be exactly correct
*Monday, January 25, 2016 by Shredder*

**Physics**

On a distant planet, an astronaut drops a wrench. The wrench falls a distance of 1.52m in a time of 0.705s. What is the acceleration due to gravity on this planet?
*Monday, January 25, 2016 by JuliePham*

**Physics**

What would be the average velocity of an object falling 1.25m from the rest, just as it strikes the ground?
*Monday, January 25, 2016 by JuliePham*

**Physics**

What would be the average velocity of an object falling 1.25m from the rest?
*Monday, January 25, 2016 by JuliePham*

**physics**

to forces are applied to a car in an effort b to move it ,as shown in figure .a) what is the resultant of these two forces ? b). if the car has a mass of 3000 kg , what acceleration does it have ? ignore friction.
*Monday, January 25, 2016 by m adnan *

**physics**

Estimate the average speed of the apollo spacecaft in m/s, given that the craft took five days to reach the moon from eaeth .the moon is 3.8*10 to the power 8m from earth.
*Monday, January 25, 2016 by m adnan*

**Mathematics,Science(physics,chemistry and biology)**

Two similarly charged identical ping pong balls are suspended from the common support with the help of two threads.Calculate angle between the two threads and also calculate the tension in two strings.
*Monday, January 25, 2016 by Shâhîd *

**physics**

a small airplane flies a straight line at the speed of 225 km/hrs. How long does it takes the plane to fly in 30km in minute, hours and seconds
*Monday, January 25, 2016 by Anonymous*

**physics**

A light rope is attached to a block with a mass of 10 kg that rests on a horizontal, frictionless surface, and a block of mass, m, is suspended from the other end. The tension in the rope is 20 N when the blocks are released. a) What is the acceleration of the 10 kg block? b) ...
*Monday, January 25, 2016 by MHECY*

**physics**

A water fall is 84 metre.If half of kinetic energy is converted into heat.What is the rise in the temperature of water?
*Monday, January 25, 2016 by uzair*

**physics**

An applied force of 450N is needed to drag a 100kg crate at a constant speed across a horizontal rough floor. Calculate the coefficient of kinetic friction for the crate on the floor.
*Monday, January 25, 2016 by Anonymous*

**physics**

You are a blacksmith and have been working with 14.0 kg of steel. When you are finished shaping it, the steel is at a temperature of 405°C. To cool it off, you drop it into a bucket containing 3.0 kg of water at 55°C. How much of this water is converted to steam? ...
*Monday, January 25, 2016 by chase *

**physics**

You drop 454 g of solid ice at −35°C into a bucket of water (1,200 g) at 45°C. Eventually, the ice all melts, and the entire system comes into thermal equilibrium. Find the final temperature of the system.
*Monday, January 25, 2016 by chase *

**physics**

Consider Joule's experiment described in the insight below. Assume the mass m = 2.3 kg and the fluid is water with a volume of 1.75 L. What is the increase in the temperature of the water when the mass moves vertically a distance z = 1.55 m?
*Monday, January 25, 2016 by chase *

**physics**

An ice cube of volume 7.6 cm3 is initially at a temperature of -11.4°C. How much heat is required to convert this ice cube into steam?
*Monday, January 25, 2016 by chase *

**physics**

An Air plane flys from san fransico to new-york about 4800km at speed of 300m/s how much time does trip take as measured by observer in the plane?B and by observer in the plane?
*Sunday, January 24, 2016 by Best*

**physics**

An Air plane flys from san fransico to new-york about 4800km at speed of 300m/s how much time does trip take as measured by observer in the plane?
*Sunday, January 24, 2016 by john*

**Physics**

An airplane has a velocity of 580 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 92 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth (answer...
*Sunday, January 24, 2016 by Frank*

**Physics**

A tennis player strikes a ball when it is 1 m above the ground, with a velocity 17 m/s at 30 degrees above the horizontal. The net is 4 m away horizontally and it is 0.6 m high. How high, vertically, above the net does the ball pass?
*Sunday, January 24, 2016 by Andy*

**Physics**

A block and tacle of 6 pulley is used to raise a load of 300n steadily through a height of 30m if the workdone against friction is 2000j. calculate the workdone by the effort,the applied effort,the efficiency of the system
*Sunday, January 24, 2016 by HAKEEM*

**Physics**

A quarterback throws a football at 38 m/s at a certain angle above the horizontal. If it took the ball 6.41 s to reach the top of its path, how long was it in the air? * I want to say that the formula you use is distance. But im not sure. O r manybe even find out what ...
*Sunday, January 24, 2016 by Ann*

**physics**

An 8.7 kg block slides with initials speed of 1.66 m/s across a level floor. How far does the block slide before it comes to rest!? I used F= m(v(sq)/2s)...is that right?
*Sunday, January 24, 2016 by Lilinau*

**Physics- HELP PLEASE!**

Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net electric...
*Sunday, January 24, 2016 by Ellie*

**Physics II**

An electron with an initial speed of 5.0 ✕ 105 m/s enters a region in which there is an electric field directed along its direction of motion. If the electron travels 9.0 cm in the field before being stopped, what are the magnitude and direction of the electric field?
*Sunday, January 24, 2016 by Beat*

**Physics **

We study three point charges at the corners of a triangle. Their charges are q1 = +4.0 10-9 C, q2 = −2.5 ✕ 10−9 C, and q3 = +5.0 10-9 C. Two distances of separation are also given, ℓ12 = 6 m and ℓ13 = 9 m. Find the net electric force on q3 1- ...
*Sunday, January 24, 2016 by Anonymous*

**Physics**

A ball is thrown straight up at a launch velocity of 15m/s. What is the velocity when it returns to the throwers hand?
*Sunday, January 24, 2016 by Barbara*

**physics**

A 960 kg sports car crosses the rounded top of a hill with a radius of 52 m. Calculate a) the force the car exerts on the road at the highest point of the hill. The speed of the car is 70 km/h.
*Sunday, January 24, 2016 by pujesh*

**physics**

An inverted image is magnified by 2 when the object is placed 22cm in front of a concave mirror. Determine the image distance and the focal length
*Sunday, January 24, 2016 by portia*

**Physics**

A 3,0kg cart moving East with a speed of 1.0ms^-1 collides head-on with a 5.0 kg cart that is initially moving West with a speed of 2.0 m.s^-1. After the collision, then 3.0 kg cart is moving to the left with a speed of 1.0 m.s^-1. IGNORE THE FRICTION, WHAT IS FINAL VELOCITY ...
*Sunday, January 24, 2016 by Asive*

**physics**

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 12.6 m/s. The cliff is 49.1 m above a flat horizontal beach as shown in the figure. a.How long after being released does the stone strike the beach below the cliff? b.With ...
*Sunday, January 24, 2016 by Help plz*

**Physics**

A 275 kg motor cycle and rider accelerate from restand reach a velocity of 20m.s-1 West.the motor cycle wheels exert an average force of 710N East on the road. Calculate the minimum time taken to reach a velocity of 20m.s-1
*Sunday, January 24, 2016 by Anonymous*

**math**

In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also,4 of them offer physics and chemistry but not biology,3 offer physic and biology but not chemistry,6 offer biology and chemistry but not physics if 13 of them offer physics only how...
*Sunday, January 24, 2016 by dapo*

**Physics**

A ball is thrown verically upwards from the top of the tower with a speed of 100 m/s. It strikes the pond near the base of the towerafter 25 second. The height of tower is
*Sunday, January 24, 2016 by mohit *