When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by
(a) the cart on the horse
(b) the ground on the horse
(c) the ground on the cart
(d) the horse on the ground
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Solution
(b) the ground on the horse
The horse pushes the ground in the backward direction and, in turn, the ground pushes the horse in the forward direction, according to Newton's third law of motion.