SAT Subject Physics Practice Question 400: Answer and Explanation

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Question: 400

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

A. no force acts on the child.
B. the momentum of the child is constant.
C. the potential energy of the child is gravitational.
D. the child's kinetic energy is constant.
E. the child's distance from the ground remains the same.

Correct Answer: E

Explanation:

The correct answer is (E). The father holds the child at the same distance from the ground. If there is displacement, there is no work done.

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