14). A crate of mass M sits on the rough bed of a truck which is moving in the positive x direction (horizontal) as shown at right. For which of the following situations will the force of friction acting on the crate be in the positive x direction? Neglect air drag on create. p). Truck slowing down. Crate not sliding. M 4). Crate sliding because the truck is slowing down. "). Truck speeding up. Crate not sliding. s). Crate sliding because the truck is speeding up. A). p, q, & r only B). q & r only C). r & s only D). None