A block  $'A'$  of mass $M$ moving with speed $u$ collides elastically with block $B$ of mass $m$ which is connected to block $C$ of mass $m$ with a spring. When the compression in spring is maximum the velocity of block $C$ with respect to block $A$ is (neglect friction)

829-58

  • A

    Zero

  • B

    $\frac {M}{M\,+\,m}u$

  • C

    $\left( {\frac{m}{{M + m}}} \right)u$

  • D

    $\frac {m}{M}u$

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