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30 June, 09:39

A flare is launched from a life raft with an initial upward velocity of 192 feet per second. How many seconds will it take for the flare to return to the sea? Use the formula

, where (h) is the height of the flare in feet and (t) is the time in seconds.

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  1. 30 June, 10:59
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    So you want height to be 0 so you plug zero into the height and solve from there. You subtract 192 from both sides to get - 192=-16tsquared. Then you would divide by - 16 and end up with 12 = t^2. Then you find the square root of 12 and get t = 3.464 seconds.
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