Calculating the coefficient of kinetic friction

[Baller123]

Homework Statement

This was a lab. We attached a weight to a pulley and connected it to a wooden block. the wooden block was placed on a wooden board on a table. we dropped the weight and calculated the time it to the block to travel a certain distance.We have the variables
T=1.28 s
Mass of wooden block=.243 kg
Mass of weight on pulley=.110 kg
d=.5 m

Homework Equations

D=vitf+1/2atf^2
F=ma
Force of kinetic friction=coefficient of kinetic friction times normal force

The Attempt at a Solution

I solved for acceleration and used that to solve for the coefficient. I'm sure that's wrong

 

[CWatters]

Your approach sounds ok to me. Provided you didn't just use F from F=MA.