Solving Force and Rest with a Skater on Ice

[enantiomer1]

Homework Statement

here's the problem
A 68.5 kg skater moving initially at 2.40 m/s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice.

Homework Equations

F= ma

The Attempt at a Solution

I'm sure this equation is reliant on finding the acceleration, but I really don't know how to do that when time (instead of distance) is our given variable
anyone know what I'm missing?

 

[enantiomer1]

okay sorry scratch that I just had a brain fart or something -.-
obviously a= m/s² so there for all I had to do was divide the velocity by the time
I swear to god I'm getting stupider sometimes