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**1. Homework Statement**

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. Homework 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.