1. The problem statement, all variables and given/known data A delivery van has two packages left that are stacked one on top of another. The upper packages has a mass of 4.0 kg and is a poorly packaged glass vase, while the lower package has a mass 6.5 kg. The coefficient of static friction between the two packages is 0.211 and the lower box is fixed to the floor of the van. Since the delivery person is late, he has been accelerating quickly whenever he has stopped and started (at lights, stop sign etc.), however he never exceeds the town's speed limit of 60 km/h. What is the minimum amount of time it takes for him to reach his top speed while still keeping the vase from breaking (sliding off the top box). 2. Relevant equations friction= coefficient x contact force fnet=ma 3. The attempt at a solution friction = 0.211x 4kg x 9.81 = 8.24N what do i do next?