The horse pulls the cart, and the cart acts on the horse with the same modulus of force directed in the opposite direction.

The horse pulls the cart, and the cart acts on the horse with the same modulus of force directed in the opposite direction. Why is the horse carrying the cart, and not vice versa?

The horse carries the cart, and not vice versa, because the horse, in addition to interacting with the cart, also interacts with the ground, pushing off from it.

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