class 9 science ques - a boy of mass 50 kg rums up a staircxase of 45 steps in 9 sec . if the height of each step of the staircase is 15 cm , find the power of the boy ??
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Total height = 45 × 15 = 675 cm = 6.75 m
Power = W/t
= (50×10/ 9) × 6.75
= 375 W
Power = W/t
= (50×10/ 9) × 6.75
= 375 W
Answered by
1
Answer:
375 W
Explanation:
Weight of the boy ,
mg= 50kg × 10 m s-¹
= 500N
Height of the staircase ,
h = 45 × 15 / 100 m
= 6.75 m
t = 9s
P = work done / time taken
= mgh / t
= 500N × 6.75 m / 9s
= 375 W
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