Coefficient of Kinetic Friction

[Medgirl314]

Homework Statement

A crate of bananas has an initial speed of 4.2 m/s². It slides across a floor, traveling 6.0m before coming to a stop. Find the coefficient of kinetic friction between the crate and the floor.

Homework Equations

F_net=ma
v²=v₀²+2aΔx

The Attempt at a Solution

v=4.2 m/s
x=6.0 m
v_f=0
Δx=6.0 m

a=v²-v₀²/2x
a=0-17.64 m/s²/12 m = 1.47m/s²
$M$N=ma
mg=a
mg=a/g
m=1.47 m/s²/9.8m/s²=.15

For a final answer of .15. This seems correct to me, but could someone please confirm?

Sorry about the doubled template, I don't know how to get rid of it without messing up my post! Any ideas?

 

[CWatters]

Looks fine to me.

 

[Medgirl314]

Thank you!