Elastic collision problem?

A cart with mass 400 g moving on a frictionless linear air track at an initial speed of 0.9 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 0.51 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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