A7kg box with initial speed6m/s slides across the floor and comes to a stop after1.4s. (a) What is the coefficient of kinetic friction? _k= (b) How far does the box move? distance = m (c) You put a3kg block in the box, so the total mass is now10kg, and you launch this heavier box with an initial speed of6m/s. How long does it take to stop? t= s