During the Construction of a High-Rise Building, a Worker Accidentally

Short Answer

During the construction of a high-rise building, a worker accidentally dropped his portable electric screwdriver from a height of 400 ft. After t sec, the screwdriver had fallen a distance of ft.
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How long did it take the screwdriver to reach the ground?
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__________ sec
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What was the average velocity of the screwdriver between the time it was dropped and the time it hit the ground?
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__________ ft/sec
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What was the velocity of the screwdriver at the time it hit the ground?
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__________ ft/sec