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What is the coefficient of friction?

So, I thought maybe I could use the equation F= (mu)n -------> F = (mu)mg

and v^2 = (Vo)^2 + 2a(x-xo);

I plugged in the final and initial velocities along with the displacement and solved for a.

Plugged a into the equation F=ma to get the force then used that number and set it equal to (mu)mg to solve for (mu). Ended up with some number that was way too large to be a coeff. of friction.

I'm guessing it was a mistake to assume the velocity of the block at the split second after the bullet exited, was the same as the velocity of the bullet.

Any help would be appreciated...