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Sphere \( A \) of mass ' \( m \) ' moving with a constant velocity \( u \)
\( \mathrm{P} \) hits another stationary sphere \( B \) of the same mass. If \( e \) is the co-efficient of restitution, then ratio of velocities of the two
W spheres \( v_{A}: v_{B} \) after collision will be :
(A) \( \frac{1-e}{1+e} \)
(B) \( \frac{1+e}{1-e} \)
(C) \( \frac{e-1}{1-e} \)
(D) \( \frac{e-1}{1+e} \)
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