Physics
posted by Kendall .
A 21.3g bullet is fired from a rifle. It takes 3.77 × 103 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
d=1/2 Vf*timeinbarrel
solve for force.
Vf^2=2Force/mass*1/2 Vf*timeinbarrel
force=Vf*mass /timeinbarrel