Homework Help: Physics to drwl please help

Posted by John on Thursday, February 16, 2012 at 9:19pm.

A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s.

(a) What is the force of friction acting on the crate?
N

(b) If the truck speeds up with an acceleration of 2.1 m/s2, what is the force of the friction on the crate?
magnitude N

(c) What is the maximum acceleration the truck can have without the crate starting to slide?
m/s^2

I posted this earlier i understand A now which is zero but part B and C are still confusing I couldnt get those please help me thnks

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