# physics

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a labourer lifts 100 stone to a height of 6m in two minute.if mass of each stone be one kilogram, calculate the average power

• physics -

total mass = 1 kg x 100 = 100 kg
height = 6 m
time taken = 2 x 60 sec = 120 s
work done = mass x g (acceleration due to gravity ) x height
work done = 100 x 9.8 x 6
= 5880 J
average power = work done / time taken
= 5880 / 120
= 49 W

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