SAT Subject Physics Practice Question 492: Answer and Explanation

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Question: 492

8. A .5 kg ball is swinging at the end of a 2 m string that has a tension of 6.25 N in it. Find the speed of the ball as it travels its circular path.

A. 3.8N
B. 4.4N
C. 5N
D. 5.6N
E. 6.2N

Correct Answer: C


The correct answer is (C). The velocity of the ball in its pathway is calculated with the centripetal force equation, , which is rearranged to

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