Homework Help: math-algebra

Posted by Michelle on Saturday, October 9, 2010 at 9:13am.

A launched rocket has an altitude, in meters, given by the polynomial h = vt -4.9t^2, where h is the height, in meters, from which the launch occurs, at velocity v in meters per second, and t is the number of seconds for which the rocket is airborne. If a rocket is launched from the top of the tower 110 meters high with an initial upward speed of 60 meters per second, what its height be after 2 seconds?

math-algebra - Reiny, Saturday, October 9, 2010 at 9:45am
If h is the height above ground level, then the equation will be

h = -4.9t^2 + 60t + 110

replace t with 2 and you got it.
math-algebra - Michelle, Saturday, October 9, 2010 at 10:31am
I got 422.08 but it says that is still wrong can you help
math-algebra - Reiny, Saturday, October 9, 2010 at 10:53am
h = -4.9(4) + 60(2) + 110
= 210.4 m

or 100.4 above the tower

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