Questions in Work, Energy and Power

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The mass of two substances are 4gm and $9gm$ respectively. If their kinetic energies are same, then the ratio of their momenta will be
If the momentum of a body is increased by 100%, then the percentage increase in the kinetic energy is
If a body looses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest
A bomb of mass 9kg explodes into 2 pieces of mass 3kg and 6kg. The velocity of mass 3kg is 1.6 m/s, the K.E. of mass 6kg is
Two masses of 1kg and 16kg are moving with equal K.E. The ratio of magnitude of the linear momentum is
A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in $m{s^{ - 1}})$
Two bodies moving towards each other collide and move away in opposite directions. There is some rise in temperature of bodies because a part of the kinetic energy is converted into
A particle of mass m at rest is acted upon by a force F for a time t. Its Kinetic energy after an interval t is
The potential energy of a weight less spring compressed by a distance a is proportional to
Two identical blocks A and B, each of mass 'm' resting on smooth floor are connected by a light spring of natural length L and spring constant K, with the spring at its natural length. A third identical block 'C' (mass m) moving with a speed v along the line joining A and B collides with A. the maximum compression in the spring is

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