Question

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

Answer 1

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

Answer 2

Horse can pull a cart because the cart is supported with a wheel . so,there is less friction between surface and wheel .therefore horse can pull it