A sphere of mass \( m \) moving with a constant velocity \( u \) hits another stationary sphere ...

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A sphere of mass \( m \) moving with a constant velocity \( u \) hits another stationary sphere of the same mass. If \( e \) is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be
[RPMT 1996; BHU 1997]
(a) \( \frac{1-e}{1+e} \)
(b) \( \frac{1+e}{1-e} \)
(c) \( \frac{e+1}{e-1} \)
(d) \( \frac{e-1}{e+1} t^{2} \)
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