A block A, whose weight is 100N, is pulled up a slope of length 5m by means of a constant force F (=100N) as illustrated.

(a) What is the work done by the force F in moving the block A, 5m along the slope?

(b) What is the increase in potential energy of the block A?

(c) Account for the difference in the work done by the force and the increase in potential energy of the block.

Find the kinetic energy of a body of mass 5 kg moving with a uniform velocity of 10 m s^-1.

Two bodies of equal masses are moving with uniform velocities v and 2v. Find the ratio of their kinetic energies.

Two bodies have masses in the ratio 5 : 1 and kinetic energies in the ration 125 : 9. Calculate the ratio of their velocities.