Question

Renu observed that as a stone of mass 1kg falls freely from a height 1m, its potential energy gets converted into kinetic energy. Therefore, its potential energy decreases and kinetic energy increases. As the stone touches the ground, all its potential energy is converted to the kinetic energy.

Rahul and Imran, each weighing 800 N, climb up a rope through a height of 10 meters. Rahul, takes 20 seconds to complete the climb, while Imran, takes 50 seconds. Calculate the power expended by each boy.

A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back?

Define power. How will you differentiate between kW and kW h? If the velocity of a ball is tripled, what will be the ratio of

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