Velocity question

1. The problem statement, all variables and given/known data
A 75-kg clown at the circus escapes from a tower by jumping from a platform located 35 m above a safety net held by six other clowns. If air resistance exerts a 110 N force on the clown as he falls, what is his velocity just before he hits the net?

2. Relevant equations
F=mg-air resistance

3. The attempt at a solution
75kg-9.8 m/s^2-110N
F=625 N

a=8.33 m/s^2

I am drawing a blank as to what velocity formula I can use in the problem.

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