At what speed would one need to fire a lead project tile in order for its temperature to rise from 25°c to 36.9°c upon impact on a stationary object

55 m/s

Explanation:

If all kinetic energy is converted to heat:

½ mv² = mCΔT

v = √(2CΔT)

v = √(2 × 128 J/kg/K × (36.9°C − 25°C))

v = 55.2 m/s

Rounded to two significant figures, the speed is 55 m/s.

measure their densities same density, same sub