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)

Give one example each of the body possessing: (i) kinetic energy, and (ii) potential energy.

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

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?

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).