In a fancy hotel, the back of the elevator is made of glass so that you can enjoy a lovely view on your ride. The elevator travels at an average speed of 1.75 m/s. A boy on the 15th floor, 80.0 m above the ground level, drops a rock at the same instant the elevator starts its ascent from the 1st to the 5th floor. Assume the elevator travels at its average speed for the entire trip and neglect the dimensions of the elevator.
a) How long after it was dropped do you see the rock?
b) How long does it take for the rock to reach ground level?
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