**Work :** The work done by a constant force is defined as the product of force in the direction of the displacement and the magnitude of the displacement. Its SI unit is joule (J).

**Energy :** The capacity of a body, animate or inanimate, to do work is termed as energy. Its SI unit is joule (J).

**Power :** Power is defined as the rate of doing work. Its SI unit is watt.

Given, m = 30 kg,

h = 30 x12.5 cm = 375 cm = 3.75 m,

t = 30 s,

P = ?

Using P = W/t = mgh/t = 30 x 10 x 3.75/30 = 37.5 W