Work And Energy...

A person carrying a load of 50 kg on his head moves 10 m on a straight horizontal road with acceleration of 2 m/s². The amount of work done by him is

Work done by centripetal force during circular motion is

The graph below represents the relation between displacement 'x' and force 'F'. The work done in displacing an object from x = 8 m to x = 14 m is approximately

A truck and a car are moving on a smooth, level road such that the kinetic energy associated with them is the same. Brakes are applied simultaneously to both of them such that equal retarding force is produced in both. Which one will cover greater distance before it stops?

A spring, which is initially in its unstretched condition, is first stretched by a length x and then again by a further length x. The work done in the first case is W₁ and in the second case is W_2.
Which of the following relations between W₁ and W₂ is correct?

A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

The work required to increase the velocity of a particle from 18 km/hr to 72 km/hr, if the mass of the particle is 2 kg, is

A stone of mass 500 gm is dropped from a certain height. When it is exactly at the midpoint of its free fall, the kinetic energy possessed by it is 800 J. What is the height from which it is dropped? (Take acceleration due to gravity of earth as 10 ms^-2)

If the momentum of a body is increased to 3 times its initial momentum, then by how much its kinetic energy will increase above its initial value which was 100 J?

Let us assume that you have lifted a suitcase from the floor and kept it on a table. The work done by you on the suitcase depends on

If the kinetic energy of a body increases by 300%, then by what percentage shall the linear momentum of body increase?

In a toy pistol, spring of spring constant 1000 N/m is compressed to 4 cm and released, which hits the ball of 10 grams initially at rest. Initial speed of the ball is

A block is moving on a rough horizontal surface with constant velocity, then

An object initially at rest starts moving under the action of the force which varies with position as F = x, work done by this force in moving the object from x = 0 to x = 2 m is

A spring 40 mm long is stretched by the application of a force. If 10 N force is required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is:

A pendulum bob has a speed of 3 m/s at its lowest position. The pendulum is 0.5 m long. The speed of the bob, when length makes an angle of 60^o to the vertical, is:

Two springs of spring constant 1500 N/m and 3000 N/m are stretched with the same force. They will have the potential energies in the ratio of:

A man carries 10 bricks to the top of a building by going up along a vertical spiral staircase in 5 minutes. A boy carries 10 bricks to the top of the building by going up a slanting ladder in 10 minutes, then

The engine of a bus of mass 5,000 kg accelerates the bus from 2 m/s to 20 m/s in 120 seconds. The power expended by the bus is

An object of mass m is dropped from height 'H' and it reaches the ground in time 'T'. Study the following graphs and then pick the correct option. (v is the speed of the object at any instant and h is the height of the object at any instant)
(1).
(2).

(3).
(4).