Rekha throws her bike key upwards from the ground with a speed v. After 0.1 sec the key just passes over one side of the roof of a building. On its way down the key just misses hitting the opposite end of the roof and finally hits the ground 1.5 seconds after it passed the roof for the first time. The width of the building is 8.4 meters. Find the initial speed v. (Assume g=10m/s²).
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