Part A A 4.9-N hammer head is stopped from an initial downward velocity of 3.2 m/s in a distance of 0.45 cm by a nail in a pine board. In addition to its weight, there is a 15-N downward force on the hammer head applied by the person using the hammer. Calculate the downward force F exerted by the hammer head on the nail while the hammer head is in contact with the nail and moving downward, Assume that the acceleration of the hammer head is constant Express your answer using two significant figures. while it is in contact with the nail and moving downward. 590 N Submit Previous Answers v Correct Part B Suppose the nail is in hardwood and the distance the hammer head travels in coming to rest is only 0.12 cm. The downward forces on the hammer head are the same as on part A. What then is the force F exerted by the hammer head on the nail while the hammer head is in contact with the nail and moving downward? Express your answer using two significant figures. ? Submit Previous Answers Request Answer

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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?”