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At which point or points is the velocity nonzero and opposite in sign to the acceleration?

A cart attached to a spring is displaced from equilibrium and then released.
There is no friction. A graph of displacement as a function of time for the cart is
shown. The arrows and signs above the cart indicate the positive and negative
directions for the position of the cart.
ADisplacement, cm
4
В
2.
G
0+
12
14
16
Time, s
E

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