# physics

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Can an object's velocity change direction when its acceleration is constant?
a) No this is not possible because it is always speeding up
b) No this is not possible because it is always speeding up or always slowing down, but it can never turn around
c) Yes it is possible and an example is a rock thrown straight up
d) Yes it is possible and a car that starts from rest, speeds up, slows to a stop and then backs up is an example

I believe the answer is c)

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