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Q.

A boy holds a mass on his stretched hand. Then

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a

Work done against gravity is zero

b

Muscular energy is used

c

Both 1 and 2

d

Neither 1 nor 2

answer is C.

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Detailed Solution

A boy holds a mass on his stretched hand. Then work done against gravity is zero and
muscular energy is used.
As the work done is the product of force and the displacement in the direction of the force.

work done = force \times displacement

In the above case, there is no displacement in the direction of the gravity. so the work done against gravity will be zero.
On the other hand, muscular energy is used to hold the mass and to keep the hand in the stretched position.

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