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The first chest from the Qiangdu has been secured and is being lifted to the surface. As a crewmember waits, she flips a coin into the air at a speed of 4 feet per second. If the coin in her hand is 23 feet directly over the surface of the water, how long will it take (in seconds) for the coin to hit the water if she fails to catch it?
Sagot :
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