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Alex is working on the following physics problem: A 0.500 kg weight is attached by a rope and pulley to a 0.250 kg cart. Find the acceleration of the cart.
He comes up with the solution: "The gravitational force acting on the weight is 4.9 N, which is the same force acting on the cart since they are connected by a string. This gives an acceleration of 19.6 m/s2 for the cart."
(a) What is wrong with Alex's solution?
(c) What should the correct answer be?
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