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AP® Physics 1 & 2

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An Accelerating Light

APPH12-RA5EEK

A strobe-light is set to flash once every second. It is in a side window of a car that is moving in the positive direction (from point A to point F). The night is 'completely dark', so that all that can be observed is the light.

The sketch below represents a photograph taken by a camera with the shutter open while the car moves from left to right. The dots represent the position of the light (and the car window) each time the light flashes on.

Which of the following that correctly describe the motion of the car during its trip from point A to point F. Select TWO answers.

A

Between points A and B, the car is accelerating slowly.

B

Between points B and C, the car has zero acceleration.

C

Between points D and E, the car has a negative acceleration.

D

Between points E and F, the car is going slower than its instantaneous speed at point C.