SOLUTION: 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 h=vt-

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Question 490175: 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 h=vt-16t^2
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
h+=+vt-16t%5E2 Find t when h = 0 and v = 192.
0+=+192t-16t%5E2 Factor out 16t.
0+=+16t%2812-t%29 Apply the "zero product" rule.
16t+=+0 or 12-t+=+0
If 16t+=+0 then t+=+o This the initial condition when the flare is first launched.
If 12-t+=+0 then t+=+12 This is the time when the flare returns to the sea (height = 0)
The answer is 12 seconds.