A 5-g lead bullet traveling in 20^{circ}C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327^{circ}C. The specific heat of lead is 0.128 J/g.^{circ}C. The heat of fusion of lead is 24.5 J/g.