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a. What is the force of friction acting on the crate?

I multiplied .30 X 176= 52.8. Online assignment says it's wrong?

frictional force= co of friction times Normal force

b. If the truck speeds up with an acceleration of 4.0 m/s2, what is the force of the friction on the crate?

magnitude:

Direction:

I simply used the kinetic friction value times the normal force and still got it wrong.

frictional force= co of friction times Normal force

(c) What is the maximum acceleration the truck can have without the crate starting to slide?

I got this right at 3 m/s