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The graph below shows the velocity vs. time for a wayward puppy moving along a path.

CMKrehbiel. Created for Albert.io. Copyright 2016. All rights reserved.

According to the graph, when does the puppy change direction, if ever?

A

$t=2.0s$

B

$t=5.0s$

C

$t=7.0s$

D

$t=2.0s$ and $t=5.0s$

E

The puppy does not change direction during the interval graphed.

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