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Consider a horse and a cart. The horse pulls on the cart, and the cart pulls...

Consider a horse and a cart. The horse pulls on the cart, and the cart pulls back on the horse. The two forces are equal and opposite, so why does the cart move at all? The reason is that the horse is also exerting a force on the ground, which is external to the horse-cart system, and the ground exerts a force back on the horse-cart system causing it to accelerate.

HOW DOES THE HORSE MOVE IF THE FORCE THE HORSE EXERTS ON GROUND IS EQUAL AND OPPOSITE TO THE FORCE THE GROUND EXERTS ON THE HORSE, hence cancelling each other out?
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