Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, an automatic weapon fires 156 bullets and each of mass is 8 gram at 360 m/s. The bullets strike his mighty chest, which has an area of 0.71 m2. Obtain the average force exerted on Superman chest if the bullets bounce back after an elastic, head-on collision.
N