The first ball of mass m moving with the...

The first ball of mass `m` moving with the velocity `upsilon` collides head on with the second ball of mass `m` at rest. If the coefficient of restitution is `e`, then the ratio of the velocities of the first and the second ball after the collision is

`(1-e)/(1+e)`

`(e-1)/(e+1)`s

`(1+e)/(e+1)`

`(2+e)/(e-1)`

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