Sam has a mass of 116kg, he attempts to see how high he can jump by performing a standing high jump. At the instant of takeoff (when he is no longer in contact with the ground) his vertical velocity is 3.7m/s and his center of gravity is 1.1 m high. a) what is Sam's vertical acceleration at the instant of takeoff? b) how much time elapses after takeoff until Sam reaches his highest peak? c) what peak height does Sam center of gravity achieve?

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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?”