A 24.0- packing case is initially at rest on the floor of a 1610- 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. What is the magnitude of the frictional force acting on the case as the truck accelerates at 2.48 m/sec^2