A boy weighing 40 kg carriers a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)
Given,
Mass of boy = 40Kg
Mass of box = 20 kg
Total mass = 40 + 20 = 60kg
g = 10m/s2
h = 15m
t = 25 sec
Power = mgh/t
=60 × 10 × 15/ 25
= 360 W
Power = 360 W