SOLUTION: please help me answer this question: a flare is launched from a life raft with an initial velocity of 80 meters per second. how many seconds will it take for the flare to return t

Question 357043: please help me answer this question:
a flare is launched from a life raft with an initial velocity of 80 meters per second. how many seconds will it take for the flare to return the sea?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a flare is launched from a life raft with an initial velocity of 80 meters per second. how many seconds will it take for the flare to return the sea?
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h(t) = -9.8t^2 + 80t
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When the flare is at sea level, it height is zero.
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Solve -9.8t^2+80t = 0
t(-9.8t+80) = 0
t= 0 when the flare leaves the raft.
-9.8t+80 = 0 when the flare hits the water.
9.8t = 80
t = 8.16 seconds
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Cheers,
Stan H.
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