A machine has a power of 20 kW. How long will it take for it to lift a body of mass 10 kg from the ground to a height of 100 m? (Assume g = 10m/s2)
Answer & explanation
Correct answer: option 3
Power = Energy x Time
(P) = (E) x (t)
20000 = (m x g x h) x t
= (10 x 10 x 100) x t
\(\Rightarrow\) t = 2 seconds.