Question

A weight lifter lifts a mass m at constant speed to a height h in time t. what is the average power output of the weight lifter?

Answer 1

power = energy / time = m g h / t

Answer 2

Answer: 9.81mh/t

Explanation:

Power = workdone/time

Work done = force x distance

Since the object is lifted at constant speed

Force = mg

Where g is the acceleration due to gravity which is always constant = 9.81m/s2

Force = 9.81m

Distance = h

So therefore workdone = 9.81mh

And Power = 9.81mh/t

Or if you the g to just be written as g

Power = mgh/t