A horse pulls a cart forward by exerting a 100N force on it through the harness. According to Newton’s third law, which of the following is the correct action–reaction force pair?
a) Force of the horse on the cart (100N forward) and friction on the cart’s wheels (100N backward).
b) Force of the horse on the cart (100N forward) and force of the cart on the horse (100N backward).
c) Force of the ground on the horse (100N forward) and force of the horse on the ground (100N backward).
d) Force of the horse on the cart (100N forward) and weight of the cart (100N downward).