Question: A 4 3 g marble moving at 2 . 1 m / s strikes a 2 6 g marble at rest. Assume the collision is

A 43 g marble moving at 2.1 m/s strikes a 26 g marble at rest. Assume the collision is perfectly elastic and the marbles collide head-on.
What is the speed of the first marble immediately after the collision?
What is the speed of the second marble immediately after the collision?

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