A boy of mass 40 kg climbs vertically upwards on a coconut tree to a height of 10m. Calculate the potential energy gained.

A boy of mass 40 kg climbs vertically upwards on a coconut tree to a height of 10m. Calculate the work done by the boy.

A rocket of 3 xx10^6 kg mass takes off from a launching pad and acquires a vertical velocity of 1 km/s at an altitude of 25 km. Calculate the potential energy, and the kinetic energy.

A body is thrown vertically upwards with a speed u. When does its potential energy becomes maximum.

A body of mass 6 kg is kept at a height of 5 m from the surface of earth. Find the potential energy of the body.

A mass of 10 kg is dropped form a height of 50 cm. Find its potential energy just before dropping.

A pebble of mass 0.05 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble:- during its upward motion.

A pebble of mass 0.06 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble:- during its downward motion.

A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the massis dissipated:- How much work does she do against thegravitational force ?