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

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

What is the velocity of the first ball?

Is this an elastic collision?

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