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If action is always equal to the reactio...

If action is always equal to the reaction, explain how a horse can pull a cart.

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To pull a cart, the horse pushes the ground backwards. Therefore, the ground exerts an equal reaction on the horse in the forward direction. The cart moves due to forward component of this force of reaction.
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PRADEEP-FORCES AND LAWS OF MOTION-ASSESSSMENT THROUGH PAPER-PEN TEST
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