I am on a planet whose acceleration due to gravity is g=6 ft/s 2 . I'm standing on a cliff edge with altitude of a=80 ft above the ground and i throw an object straight up at a velocity of v=20 ft/s....

I am on a planet whose acceleration due to gravity is g=6 ft/s². I'm standing on a cliff edge with altitude of a=80 ft above the ground and i throw an object straight up at a velocity of v=20 ft/s. The equation y=-1/2gt²+vt+a gives the height y of the object t seconds after i thow it. The graph of height versus time will be a parabola.

-Find the exact vertex of the parabola. (Give both coordinates as rational number.) What does the vertex represent in the context of this problem?

-Find the exact time in seconds when the object will land on the ground, then approximate it to four decimal places.