1.

A machine has a power of 20kW. How long will it take for it to lift a body of mass 10kg from the ground to a height of 100m? (Assume g = 10m/s^2)(a) 1 second(b) 2 seconds(c) 3 seconds(d) 4 secondsThis question was posed to me in quiz.My question is taken from Power topic in division Work, Energy and Power of Physics – Class 11

Answer»

Correct ANSWER is (b) 2 seconds

Best explanation: POWER (P) = Energy (E) X Time (t)

20,000 = (m x G x H) x t

 = (10 x 10 x 100) x t

t = 2 seconds.



Discussion

No Comment Found

Related InterviewSolutions