work = m g h = 70 * 9.81 * 2.2 joules
power = work in Joules /time in seconds
= 70 * 9.81 * 2.2 / 1.2
in Joules per second which is WATTS
a weigh lifter raises a 70-kg barbell from the floor to a height of 2.2 m in 1.2s what was his average power output during the lift?
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