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In space, a 4.0kg metal ball moving 30m/s has a head-on collision with a stationary 1.0kg...

In space, a 4.0kg metal ball moving 30m/s has a head-on collision with a stationary 1.0kg second ball. After the collision, the second ball is traveling at 40m/s.

A) What is the velocity of the first ball?

B) Is this an elastic collision? (show. no credit without proof)

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