MCAT Physics Question 3: Answer and Explanation

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Question: 3

3. A car is traveling at and the driver puts on the brakes, bringing the car to rest in a time of 6 s. What is the magnitude of the average acceleration of the car?

  • A.
  • B.
  • C.
  • D.

Correct Answer: C

Explanation:

The magnitude of the average acceleration is the change in velocity divided by the time. The velocity changes by

because the car comes to rest. The time, in hours, is

The average acceleration is then

This question asked for the magnitude of this acceleration, which is

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