physics. need help fast
posted by ricki .
A 5kg bullet fired from a gun at 725m/s becomes embedded in a .50kg block of wood that is free to move along a surface and the coefficient of friction .355 between the surface and block of wood. find the distance it slides acroos the table.

LOL had the same question as you, this is the help I got:
Use conservation of momentum to get the initial velocity of the block with imbedded bullet.
Then set the initial kinetic energy of block & bullet equal to the work done against friction, and solve for trhe sliding distance.
Check to make sure the bullet weight is really 5 kg. That is more like a cannonball. I suspect it is really 5 g. 
can you tell me the formulas to use

Now that you've had the help, have you tried applying it?

yes, but i don't think that i am applying it the right way.