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Two balls of equal mass have a head-on collision with speed `6 m//s`. If the coefficient of restitution is `(1)/(3)`, find the speed of each ball after impact in `m//s`

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The correct Answer is:
`2 m//s`
Just before collision
Just after collision
By definition of `e : e = (v_(2) - v_(1))/(u_(1) - u_(2)) rArr (1)/(3) = (v + v)/(6 + 6) rArr v = 2 m//s`
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