A wooden block (mass M) is hung from a peg by a massless string .A speeding

A wooden block (mass M) is hung from a peg by a massless string .A speeding bullet (with mass m and initial speed`v_(0)`) collides with block at time t=0 and embeds in it. Let S be the system consisting of the block and bullet. Which quantities are NOT conserved between t=-10 sec t=+10 sec?

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