AP Physics 1 Question 220: Answer and Explanation
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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
Correct Answer: C
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.