1.

A big ball of mass M, moving with velocity u strikes a small ball of mass m, which is at rest. Finally small ball obtains velocity u and big ball v. Then what is the value of v             [RPET 2001]

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


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