Homework Help: Physics

Posted by Adrian on Thursday, January 24, 2013 at 9:42pm.

The height of a rocket is launched from a platform 12 meters above the ground is modeled by the function h(t)=-4.9t^2+25t+12 where h(t) represents the height of the rocket in meters and t represents the number of seconds after launching. How many seconds after launching will the rocket return to the ground?

Physics - bobpursley, Thursday, January 24, 2013 at 9:48pm
h(t)=0
so
4.9t^2-25t-12=0
use the quadratic equation, solve for t.

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