An elevator moves downward in a tall building at a constant speed of 3.45 m/s. Exactly 3.50 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the bolt falls from rest.
a)At what time does the bolt hit the top of the still-descending elevator?
b) Estimate the highest floor from which the bolt can fall if the elevator reaches the ground floor before the bolt hits the top of the elevator. (Assume 1 floor 3 m.)

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