Friction Force FBD

1. The problem statement, all variables and given/known data
What is the greatest acceleration that can be generated by a runner if the coefficient of static friction between shoes and road is 0.95?

2. Relevant equations
Fnet = ma
Force of static friction: usN
Weight= mg

3. The attempt at a solution
FBD: Positive x axis is to the right. Positive y axis is to the top. Normal force pointing up, equal in magnitude to weight pointing down. Friction must point in the positive x direction.

f = max
ax = usg
amax = (0.95*9.81)
= 9.3 m/s2

I just have one question. Does the friction force point to the right, in the direction of the positive x axis? Thanks!

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