A boy of mass 50 kg runs up a staircase of 45 steps in 9s . if the height of each step is 15 cm , find his power . Take g = 10 m s-²
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Total height man has to climb
= no of steps × height of each step
= (15 × 45)cm
=6.75m
Therefore, potential energy
= mgh
= 50 × 10 × 6.75
= 3375 J
Power = energy ÷ time
= 3375 ÷9
= 375 W
Answered by
3
Answer:
375 W
Explanation:
Weight of the boy ,
mg = 50 kg × 10 m s-² = 500N
Height of the staircase,
h = 45 × 15 / 100 m = 6.75 m
Time taken to climb , t = 9 s
power , p = Work done / time taken
= mgh
_______
t
= 500 N × 6.75 m
___________________
9 s
= 375 W.
power is 375 W...
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