MCAT (Medical College Admission Test) Question:
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Which of the following must be known in order to determine the power output of an automobile?


1. Final velocity and height
2. Mass and amount of work performed
3. Force exerted and distance of motion
4. Work performed and elapsed time of work

Answer: D

Explanation: Power is defined as the rate of doing work. For the automobile, the power output is the amount of work done (overcoming friction) divided by the length of time in which the work was done. Therefore, answer choice D is the best answer

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