Question

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

Answer 1

No, because the newton's third law pair forces act on different bodies, with equal magnitude but in opposite direction. The horse pushes back the ground. ... Since the cart is bound to the horse, hence it also moves due to the forward acting force on the horsein perfect accordance with Newton's third law.

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Answer 2

A horse pushes the ground in the backward direction. According to Newton’s third law of motion, a reaction force is exerted by the Earth on the horse in the forward direction. As a result, the cart moves forward.