How Long Does It Take for a Bullet to Stop in Wood?

[envoystud]

momentum question...REALLY NEED HELP!

Homework Statement

A .22 rifle bullet, traveling at 350 m/s, strikes a block of soft wood, which it penetrates to a depth of 0.130m . The block of wood is clamped in place and doesn't move. The mass of the bullet is 1.80g. Assume a constant retarding force.

??-How much time is required for the bullet to stop? (in seconds)

??-What force, in Newtons, does the wood exert on the bullet?

Homework Equations

The Attempt at a Solution

well honestly, i have no idea where to begin... can some one please help me

 

[Dick]

Kinematics, think x(t)=x0+v0*t+(1/2)*a*t^2. What acceleration is required to stop the bullet? Once you have a, what force is needed to stop the bullet? Now think of Newton's third law.