Bullet & Block II

A bullet of mass 5.5 g is fired horizontally into a 2.0 kg wooden block at rest on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.15. The bullet stops in the block, which slides straight ahead for 2.0 m (without rotation).

(a) What is the speed of the block immediately after the bullet stops relative to it?
(b) At what speed is the bullet fired?