PART 4. A cart with mass 600 g moving on a frictionless linear air track at an initial speed of 1.5 m/s un- dergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 1 m/s. (a) What is the mass of the second cart?  (b) What is its speed after impact?  (c) What is the speed of the two-cart center of mass?

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