A child on a sled has been given a push so that he is moving up a hill. The hill is covered with icy snow and can be treated as frictionless. The child has a mass of 22.7 kg; the sled has a 3.18 kg. How far will he go before coming to a stop if his speed is 2.44 m/s when he starts at the bottom of the hill? He holds on tightly and so does not fall off the sled, and the hill makes an angle of 25.50 with the horizontal. a. 0.29 m b. 1.14 m c. 1.41 m d. 0.70 m

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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?”