If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?

Give two examples where a body possesses both, kinetic energy as well as potential energy.

How much is the mass of a man if he has to do 2500 joules of work is climbing a tree 5 m tall? (g = 10 m s²)

A boy weighing 40 kg makes a high jump of 1.5 m.

(i) What is his kinetic energy at the highest point?

(ii) What is his potential energy at the highest point? (g = 10 m/s²).

What type of energy is possessed?

(a) By the stretched rubber strings of a catapult?

(b) By the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?