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?
2 answers:
Answer: 9.81mh/t
Step-by-step 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
<span>power = energy / time = m g h / t</span>
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