AP Physics 1 Question 82: Answer and Explanation

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Question: 82

2. An object has a kinetic energy of k. If the speed of the object were doubled what would be the resulting kinetic energy?

  • A. K
  • B. K
  • C. 2K
  • D. 4K

Correct Answer: D


DK = mv2, so if we double the velocity we don't double the kinetic energy, we actually quadruple it:

K' = m(2v)2 = 4 (mv2) = 4K