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25 September, 12:05

A rescuer on a helicopter that is 50 feet above the sea drops a lifebelt. The distance from the lifebelt to the sea can be modeled by the equation below, where h (t) represents the lifebelt's height from the sea at any given time, t is the time in seconds, and s is the initial height from the sea, in feet. How long will it take for the lifebelt to reach the sea? Round your answer to the nearest tenth of a second.

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  1. 25 September, 15:06
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    When the lifebelt reaches the sea, h=0 so

    -16t^2+50=0

    -16t^2=-50

    t^2=25/8

    t=√ (25/8) seconds

    t≈1.8 seconds
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