SOLUTION: a rocket is fired with and initial speed of 1764m/s. After how many seconds will it hit the ground?

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Question 369967: a rocket is fired with and initial speed of 1764m/s. After how many seconds will it hit the ground?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
I'm assuming fired straight up at 1764 m/s.
h%28t%29=-%281%2F2%29gt%5E2%2Bv%5B0%5D%2At
h%28t%29=-4.9t%5E2%2B1764t
Find t when h=0.
%28-4.9t%2B1764%29t=0
Two solutions:
t=0sec
.
.
.
-4.9t%2B1764=0
4.9t=1764
t=1764%2F4.9
highlight%28t=360%29sec