SAT Subject Physics Practice Question 35: Answer and Explanation

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Question: 35

1. An object of mass 2 kg has a linear momentum of magnitude 6 kg • m/s. What is this object’s kinetic energy?

A. 3 J
B. 6 J
C. 9 J
D. 12 J
E. 18 J

Correct Answer: C

Explanation:

The magnitude of the object’s linear momentum is p = mv. If p = 6 kg • m/s and m = 2 kg, then v = 3 m/s. Therefore, the object’s kinetic energy is K = mv2 = (2 kg)(3 m/s)2 = 9 J.

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