Example 11.8 A boy of mass 50 kg runs
up a staircase of 45 steps in 9 s. If the
height of each step is 15 cm, find his
power. Take g = 10 m s-2
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Answer:
distance travelled = 45 * 15
= 675 cm = 6.75 m
power = energy/time
= mgh / time
= 50 * 10 * 6.75 / 9
= 675 * 5 / 9
= 75*5
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