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A 30.0-kg packing case is initially at rest on the floor of a 1500-kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30, and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling due north at constant speed. Find the magnitude and direction of the friction force acting on the case

(a) When the truck accelerates at 2.20 m/s' northward and

(b) When it accelerates at 3.40 m/s2 southward.

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