a) the ball hits the ground when:Originally Posted by JohnSena
This will have two roots, one positive and the other negative, the
negative root is unphysical but the positive one is what you want.
The roots are:
So the ball is in the air seconds.
b) The maximum height is achieved when is
a maximum. As this is a quadratic we know this occurs midway
between the roots, so it occurs at ,
so the maximum height is:
c) Already answered at seconds.