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## 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, f

_{k}=μ

_{k}N, [itex]\Sigma[/itex]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.