SAT Subject Physics Practice Question 224: Answer and Explanation

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Question: 224

70. A particle travels in a circular path of radius 0.2 m with a constant kinetic energy of 4 J. What is the net force on this particle?

A. 4 N
B. 16 N
C. 20 N
D. 40 N
E. Cannot be determined from the information given

Correct Answer: D

Explanation:

Because the particle travels in a circular path with constant kinetic energy (which implies constant speed), the net force on the particle is the centripetal force.

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