Question

Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s⁻²)

Avinash can run with a speed of 8 m s⁻¹ against the frictional force of 10 N, and Kapil can move with a speed of 3 m s⁻¹ against the frictional force of 25 N. Who is more powerful and why?

The power of a motor pump is 2 kW. How much water per minute the pump can raise to a height of 10 m? (Given g = 10 m s⁻²)