A projectile shot up from the top of a building 80 feet above the ground with a velocity of 64 feet per second. The height after t seconds is given by the functions h(t)=-16t^2+64t +80.
a. What is the maximum height of the projectile?
b. When does the projectile hit the ground?
a. What is the maximum height of the projectile?
b. When does the projectile hit the ground?