Ahorse is urged to pull a wagon. the horse refuses to try, citing newton’s third law as a defense: the pull of the horse on the wagon is equal but opposite to the pull of the wagon on the horse. "if i can never exert a greater force on the wagon than it exerts on me, how can i ever start the wagon moving? " asks the horse.

a. how would you respond to the horse? in other words, how could you convince him that newton’s third law doesn’t prevent him from pulling the wagon?

Horse have to push the ground strongly in backward direction due to which it will get reaction force in forward direction.

Explanation:

As per newton's III law we know that every action has equal and opposite reaction force

So when horse apply some force on the wagon then equal and opposite amount of force will act on the horse by the wagon

So on the system of horse and cart net force is always zero.

Now in order to start this motion we can say that horse must have to push the ground strongly so that he will get reaction force in opposite direction.

Due to this strong reaction force the horse + cart system will get the reaction force in forward direction and this force will help the system to move forward direction

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