A sphere of mass $m$ travelling at constant speed $v$ strike another sphere of same mass. If  coefficient of restitution is $e$, then ratio of velocity of both spheres just after collision is :-

  • A

    $\frac{1-e}{1+e}$

  • B

    $\frac{1+e}{1-e}$

  • C

    $\frac{e+1}{e-1}$

  • D

    $\frac{e-1}{e+1}$

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