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Two carts mounted on an air track are moving toward one another. Cart 1 has a speed of0.9m/sand a mass of0.39kg.Cart 2 has a mass

Two carts mounted on an air track are moving toward one another. Cart 1 has a speed of 0.9 m/s and a mass of 0.39 kg. Cart 2 has a mass of 0.72 kg.

(a) If the total momentum of the system is to be zero, what is the initial speed (in m/s) of Cart 2?

(b) Determine the system's kinetic energy (in J)

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