An elevator accelerates upward at 1 m/s2. When the elevator is moving upward at 2 m/s, a bolt drops from the ceiling which is 2.5 m above the? or. Assume that the bolt does not experience air resistance. Calculate how long it takes for the bolt to hit the? or, how far it travels, and how fast it is going when it hits the ? or of the elevator. Solve this problem in two reference frames, one? xed with respect to the building and one ?xed with respect to the elevator. Only the fall time will be the same for the two reference frames. In this and subsequent problems you solve in dynamics, think about the advantages and disadvantages of various reference frames and clearly state what reference frame you ultimately choose for your solution.