Physics
posted by Elisa .
A 4.0 g bullet leaves the muzzle of a rifle with a speed of 310 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.9 m long barrel of the rifle?

Force x distance = Work done on bullet
= kinetic energy increase = (1/2)MV^2
Solve for the Force 
Hello. I keep repeating the problem and I get a huge number.

Show your work. Make sure the mass of the bullet is converted to kg.
F = (1/2) M V^2 / (0.9 m)
The answer will be in Newtons if m is in kg and V is in m/s. 
it worked now.. thank you.. i forgot to convert!

A force of 2.3 N is exerted on a 6.6 g rifle bullet. What is the bullet's acceleration

A 4.1g bullet leaves the muzzle of a rifle with a speed of 300 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.81mlong barrel of the rifle?

my answer is 214N. is that right?

rigth

right