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The work done by all the forces (external and internal) on a system equals the change in

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Important Questions on Work, Energy and Power

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A body starts from rest with uniform acceleration and acquires a velocity V in time T. The instantaneous kinetic energy of the body after any time t is proportional to:
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The total work done on a particle is equal to the change in its kinetic energy
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When a man walks on a horizontal surface with constant velocity, work done by
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Given that the displacement of the body in metre is a function of time as follows x=2t4+5. The mass of the body is 2 kg. What is the increase in its kinetic energy one second after the start of motion?
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A force F acting on an object varies with distance x as shown here. The force is in N and x is in m. The work done by the force in moving the object from x=0 to x=6 m is

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The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is
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You lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase depends on
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A block weighing 10 N travles down a smooth curved track AB joined to a rough horizontal surface (figure). The rough surface has a friction coefficient of 0.20 with the block. If the block starts slipping on the track from a. point 1.0 m above the horizontal surface, the distance it will move on the rough surface is:

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