1.

A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their final velocities are V and v respectively. The value of v is                         [MP PET 1995]

A.          \[\frac{2uM}{m}\]        
B.          \[\frac{2um}{M}\]
C.          \[\frac{2u}{1+\frac{m}{M}}\]                          
D.          \[\frac{2u}{1+\frac{M}{m}}\]
Answer» D.          \[\frac{2u}{1+\frac{M}{m}}\]


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