Friction Force - Bullet hitting a sandbag

Kristenx2

Homework Statement

A rifle bullet with a mass of 15.5 g traveling toward the right at 262 m/s strikes a large bag of sand and penetrates it to a depth of 24.2 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

Homework Equations

F⃗ net=ΣF⃗ =ma⃗, fkkN, $\Sigma$F=n+f+mg=ma

The Attempt at a Solution

I have no idea where to start. I tried drawing a force diagram, but I can't figure out how to use my givens all in one equation.