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If someone could help me get started on part a that would be great.

So far i have tryed using P =m1v1 and cant seem to find any other equations that would help with the problem.

Any help is great!

Thank You

Problem:

A cart with mass 390 g moving on a frictionless linear air track at an initial speed of 1.2 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 0.57 m/s.

(a) What is the mass of the second cart?

grams

(b) What is its speed after impact?

m/s

(c) What is the speed of the two-cart center of mass?

m/s