A person standing close to the edge on top of a \( 80 \) -foot building throws a ball vertically upward. The quadratic function \( h = - 16 t ^ { 2 } + 64 t + 80 \) models the ball's height above the ground, \( h \) , in feet, seconds after it was thrown.
a) What is the maximum height of the ball?
__________feet
b) How many seconds does it take until the ball hits the ground?
___________seconds