Superman leaps in front of Lois Lane to save her from a volley
of bullets. In a 1-minute interval, an automatic weapon fires 158
bullets, each of mass 8.0 g, at 420 m/s. The bullets strike his
mighty chest, which has an area of 0.73 m2. Find the average force
exerted on Superman's chest if the bullets bounce back after an
elastic, head-on collision. Answer in N