a) 7.7x10 w
b) 8.8x10w
c) 9.5x10 W
d) 10.2x104 w
e) 13.5x10' w
8. A 70 kg sportsman runs up a long flight of stairs in 4s. The vertical hecht of the
is 4.5 m. What will be his power output in watts?
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Answer:
Explanation:
Given mass of sportsman= 70kg
Time taken to run up stairs = 4s
Height of stairs = 4.5m
Therefore = Power = Work/Time = Energy/Time = mgh/t
=70*10*4.5/4 = 7.875*10^2 W
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