A 15-g lead bullet traveling at 220m/s passes through a thin wall and emerges at a speed

Question:

A 15-g lead bullet traveling at 220m/s passes through a thin wall and emerges at a speed of 160 m/s. If the bulled absorbs 50% of the heat generated.
(a) What will be the temperature rise of the bullet?
(b) If the bullet’s initial temperature was 20oC, will any of the bullet melt, and if so, how much?