as with all quadratics ax^2+bx+c, the vertex (max or min) is at -b/2a
The max height is c - b^2/4a
since s = 16t(9-t) the roots (where s=0, that is, the object is on the ground) are at t=0, 9
don't forget your general knowledge about parabolas when you are confronted by the equation ...
An object is projected directly upward from the ground. After t seconds it’s distance in feet above the ground is s=144t-16t^2
How long does it take the object to reach its maximum height?
What is the maximum height the object reaches? When does it hit the ground?
1 answer
1 answer