Maximum deceleration before crate slides off truck

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Intrusionv2
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Homework Statement



A crate is sitting on the back of a truck at 20 m/s with a μ of 0.4. With what acceleration can the truck stop without having the crate slide?


Homework Equations



I'm not sure if I am supposed to use this equation:

a = μ(9.8)


The Attempt at a Solution



a = 0.4(9.8) = 3.92 m/s^2.
 

Discussion

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That is correct, nice job.
 
So is the 20 m/s not needed?
 
That is correct. You are only asked for acceleration (or deceleration in this case), so initial velocity doesn't come into play.