A car travels a certain distance along a straight road and on the way must stop

Question

A car travels a certain distance along a straight road and on the way must stop at traffic lights and obey the local speed limits. The distance the car travels as a function of time is shown in the figure below. Choose all the correct answers which apply to the speed of the car.

Refer to the figure above, and choose ALL the correct answers which apply to the acceleration of the car.

Correct Incorrect  The acceleration is not zero at 6.4 min.
Correct Incorrect  The acceleration is not zero at 2.7 min.
Correct Incorrect  The acceleration is zero at 1.0 min and 2.7 min.
Correct Incorrect  The acceleration is never negative.
Correct Incorrect  The acceleration is not zero at 3.3 min.

Explanation / Answer

Correct The acceleration is not zero at 6.4 min.
Incorrect  The acceleration is not zero at 2.7 min.
Incorrect  The acceleration is zero at 1.0 min and 2.7 min.
Correct The acceleration is never negative.
Correct The acceleration is not zero at 3.3 min

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