Find (a) the speed at which the bullet emerges from the block

[imdiskid06]

a .005 kg bullet with and initial speed of 400 m/s is fired through a 1 kg block. The block is at rest on a frictionless, horizontal surface, is connected to a spring of force constant 900N/m. If the block moves .05m to the right after impact. Find (a) the speed at which the bullet emerges from the block and (b) the energy lost in the collis ion.

 

[jdstokes]

Use conservation of momentum and then use the speeds you find to calculate the change in KE.