ou have been asked to design a "ballistic spring system" to measure the speed of bullets. A spring whose spring constant is kk is suspended from the ceiling. A block of mass MM hangs from the spring. A bullet of mass mm is fired vertically upward into the bottom of the block. The spring's maximum compression dd is measured from its initial suspended position.

What was the speed of a 10 gg bullet if the block's mass is 2.2 kgkg and if the spring, with kkk = 60 N/mN/m, was compressed by 40 cmcm?