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