A lead bullet weighing 0.0200 lbf and traveling horizontally at 3000 ft/s is suddenly stopped by a perfectly rigid object that does not deform during the impact. Find the temperature rise of the bullet assuming the impact occurs so rapidly that the impact process can be considered to be adiabatic. For lead, use delta u = 0.0130 (delta T) in Btu/lbm, where T is in °F or R.