A boxer quickly learns to move his head backward when he sees he is going to receive a jab to the head. What does this head motion accomplish?   It increases the momentum and decreases the force   It increases the contact time which decreases the force   It decreases the contact time which decreases the force   It causes confusion on the opponent.   none of the above

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”