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.

A ball of mass 0.5 kg slows down from a speed of 10ms^-1 to that of 6ms^-1. Calculate the change in kinetic energy of the ball.

A canon ball of mass 500g is fired with a speed of 15m/s^-1.

Find:

(i) its kinetic energy and

(ii) its momentum.