A father holds his child on his shoulders during a parade. The father does no work during the parade because:

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The momentum of the child is constant

The potential energy of the child is varying

The child's kinetic energy is constant

The child's distance from the ground remains the same

answer is D.

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Detailed Solution

A father holds his child on his shoulders during a parade. The father does no work during the parade because the child's distance from the ground remains the same

We know work is given by,
W=fd cosθ
In the given example, the father exerts a force on a child in the upward direction and his displacement is in a forward direction, therefore angle between force and displacement is 90o due to this work done being zero. Also, there is no upward or downward displacement of a child taking place as the work done is zero. Hence child's distance from the ground remains the same.

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