A cart moving at 9 m/s collides elastically with a second ball with mass of 8...

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A cart moving at 9 m/s collides elastically with a second ball with mass of 8...

A cart moving at 9 m/s collides elastically with a second ball with mass of 8 kg that is initially at rest. If the second cart moves away at 4 m/s after the collision, find the mass of the first ball.
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