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## Homework Statement

A 15g bullet strikes and becomes embedded in a 1.10kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is .25, and the impact drives the block a distance of 9.5m before it comes to rest, what was the muzzle speed of the bullet?

## Homework Equations

m

_{1}v

_{1}+m

_{2}v

_{2}=m

_{1}v'

_{1}+m

_{2}v'

_{2}

## The Attempt at a Solution

I know I will eventually use the above equation in order to solve for V

_{1}but i don't quite understand had to use the other information given such as the friction in order to get to this point in the problem solving process. Any advice please?