posted by Kendall on .
A 21.3-g bullet is fired from a rifle. It takes 3.77 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 779 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.
Vf^2=Vi^2 + 2ad
but a= Force/mass
d=length of barrel, d=avgvelocity*time
solve for force.