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Question

An adult weighing 600 N raises the centre of gravity of his body by 0.25 m while taking each step of 1 m length in jogging. If he jogs of 6 km, the energy utilised by him in jogging is:

A
9×106J
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B
9×105J
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C
6×106J
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D
6×105J
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Solution

The correct option is B 9×105J
Here, mg=600 N,h=0.25 m
Length of each step =1 m
No of steps in 6 km is N=6×103m1 m=6000
Energy utilised in jogging is
E=Nmgh
=6000×600 N×0.25 m
=9×105J.

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