A hauling truck is traveling on a level road. The driver suddenly applies the brakes, caus...

A hauling truck is traveling on a level road. The driver suddenly applies the brakes, causing die truck to decelerate by an amount g/2. This causes a box in the rear of the truck to slide forward. If die coefficient of sliding friction between the box and the truckbed is , find the acceleration of the box relative to (a) die truck and (b) the road.