Question

A man pushes a boulder with a mass of 50kg from rest to a final velocity of 3

m/s. It takes him 4 seconds to do it. How much power did the man use?
How much power did the man use?

Answer 1

Power = 56.25 W

Step-by-step explanation:

Power = workdone/time taken

We are given;

Mass; m = 50 kg

Final velocity; v = 3 m/s

Time; t = 4 s

Workdone = ½mv² = 1/2 × 50 × 3²

W = 25 × 9

W = 225 J

Thus;

Power = 225/4

Power = 56.25 W