A ball with a mass of #3 kg # and velocity of #9 m/s# collides with a second ball with a mass of #7 kg# and velocity of #- 2 m/s#. If #80%# of the kinetic energy is lost, what are the final velocities of the balls?

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Answer 1 · 2017-07-19T20:38:25

I tried this but check my maths anyway.

Have a look:
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I also got two other solutions but they do not seem correct.