Question

i. If power of an engine is 600 W, how much time will it take to lift a box of 20 kg by a distance of 10 m?​

Answer 1

Power = (m * g * h) / t

where m = the mass of the body; g = the acceleration due to gravity and h = the height the body has fallen ; t is the time the body has fallen

Putting the value in above formula we get :-

600 = 20 × 10 × 10 / time

600T = 2000

Hence T = 10/ 3 mins

10/ 3 minutes is time taken to lift the box.