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SAT® Subject Test in Physics

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Difficult

Helicopter Location

SATPHY-EG9YJA

The velocity-time graphs below represent the motion of two remote control helicopters moving through the air along a north and south line at slightly different altitudes, so that they do not collide.

The purple graph represents the motion of a purple helicopter, and the yellow graph represents the motion of a yellow helicopter.

At what time are the helicopters at the same (north-south) position, assuming they started at the same position at "zero" time?

A

At 5 seconds.

B

At 15 seconds.

C

At 25 seconds.

D

At 30 seconds.

E

The purple helicopter and the yellow helicopter are never at the same north-south position after "zero" time.