SOLUTION: Can you please help me with this question: A flare with an initial velocity of 144 feet per second is launched from a life raft. How many seconds will it take for the flare to retu

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Question 30280: Can you please help me with this question: A flare with an initial velocity of 144 feet per second is launched from a life raft. How many seconds will it take for the flare to return to the sea?
I only this much of it:
h=144t- 16t(squared) I dont think it is right though
Thank you very much!!!
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
THe formula is given by :

WHere v is the velocity:

Differentate and multiply the result by 2

32t=144

t=4.5

2(4.5)=9





Or you can factor it:





you get:

t=0 or t=9





Hence, the time for the flare to return to the sea is 9 second.

Paul.