1. The problem statement, all variables and given/known data Suppose a gangster sprays Superman's chest with 3 g bullets at the rate of 100 bullets/min, and the speed of each bullet is 500 m/s. Suppose too that the bullets rebound straight back with no change in speed. What is the magnitude of the average force on Superman's chest? 2. Relevant equations J = FavgT p = mv J = pf - pi 3. The attempt at a solution I don't really understand how to get the delta T. I got J = -3 Ns from equation 3, don't know where to go from there.