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Q.

While a person climbs stairs, the gravitational potential energy of the person increases. The source of this energy is

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a

Work done by frictional force from the steps 

b

Work done by normal force from the steps 

c

Work done by internal forces within the person's body

d

Work done by air resistance 

answer is D.

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Detailed Solution

Muscular energy stored in the muscles helps to climb the stairs and here, the potential energy is gained.

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