A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because
A) these forces are not an action-reaction pair.
B) there is nevertheless still an unbalanced force on the wagon.
C) the horse pulls on the wagon a brief time before the wagon reacts.
D) the wagon does not accelerate because these forces are equal and opposite.
E) unlike the horse, it is not alive.
B
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