Two carts mounted on an air track are moving toward one another. Cart 1 has a speed of 1.2 m/s and a mass of 0.43 kg. Cart 2 has a mass of 0.60 kg. (a) If the total momentum of the system is to be zero, what is the initial speed (in m/s) of Cart 2? (Enter a number.) m/s     (c) Determine the system's kinetic energy (in J) in order to substantiate your answer to part (b). (Enter a number.)

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