SAT Subject Physics Practice Question 30: Answer and Explanation

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Question: 30

7. A block of mass 3 kg slides down an inclined plane of length 6 m and height 4 m. If the force of friction on the block is a constant 16 N as it slides from rest at the top of the incline, what is its speed at the bottom?

A. 2 m/s
B. 3 m/s
C. 4 m/s
D. 5 m/s
E. 6 m/s

Correct Answer: C


Apply conservation of mechanical energy (including the negative work done by Ff, the force of sliding friction).

Note: Wtotal = ∆K could also be used.

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