A 20kg box rests on the flat floor of a truck. The coefficients of friction between box and floor are `mu_(s)`= 0.15 and `mu_(k)`=0.10. The truck stops at a stop sign and then starts to move with an acceleration of `2 m/s^(2)`. If the box is 2.2 m from the rear of the truck when the truck starts, how much time elapses before the box falls of fthe rear of the truck? How far does the truck travel in this time.