Determine the work of gravity over a stone with a mass of m = 5kg when it falls from a height of h = 80m to the ground.

These tasks: m (the mass of the stone, over which the force of gravity performed work) = 5 kg; h (height from which the stone fell) = 80 m.

Reference data: g (acceleration due to gravity) ≈ 10 m / s2.

The value of the work of gravity will correspond to the change in the potential energy of the stone: A = m * g * h.

Calculation: A = 5 * 10 * 80 = 4000 J (4 kJ).

Answer: Gravity will do 4 kJ work on the stone.