# Physics help on minimum stopping distance

I am having a huge problem with this physics problem....I just can't figure it out. Please help me if you can.
Heres the problem:
A load of steel with a mass of 6000 kg rests on a flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 8000 N. When the truck is traveling 20 m/s, what is the minimum stopping distance if the load is not to slide foreward into the cab?

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F = ma
$$a_{avg}=\frac{\Delta v}{\Delta t}$$