A horse exerts 500N 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) nevertheless there is still an unbalance force on the wagon
C) the horse pulls on the wagon a brief time before the wagon reacts
D) the wagon doesn't accelerate because these forces are equal and opposite.
Answer: B
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