SAT Subject Physics Practice Question 506: Answer and Explanation

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Question: 506

7. A 7.25 kg bowling ball is rolled onto a perfectly level surface at a velocity of 10 m/s. The co-efficient of friction between the surface and the bowling ball is .0025. If the surface is perfectly level and is long enough, how far will the bowling ball roll before it comes to a complete stop?

A. 20 m
B. 200 m
C. 2 km
D. 20 km
E. 1/2 km

Correct Answer: C


The correct answer is (C). The problem can be solved as a combination work-energy theorem problem. KE = Work is restated as 1/2 mv2 = (Ff)(s)(cosθ). The Ff is found by using the equation for frictional force, Ff = μN. Put it all together and solve

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