A 10-kg crate is placed in the bed of a truck at rest on horizontal ground. The truck accelerates uniformly at 1 m/s^2for 10 seconds. The crate does not slip during this acceleration.
(a) What force does work on the crate during this acceleration?
(b) What is the sign of the work done on the crate.
(c) What is the coefficient of static friction between the truck bed and the crate?