A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m/s²)

A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m/s², calculate:

(a) Potential energy acquired by the weights.

(b) Work done by the weightlifter.

Define the term ‘work’. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.

When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.

How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?