A $15\mathrm{.}0$ g bullet $($m$)$ moving directly upward at $1200$

$($m$)/($s$)$ strikes and passes through the center of mass of a $6\mathrm{.}00$ kg wood block $($M$)$ initially at

rest. The bullet emerges from the block moving directly upward at $400($ m$)/($s$).$ You may

ignore gravity during the collision since it happens in a very short period of time.