A projectile is fired vertically upward from a height of 300 300 feet above the ground, with an initial velocity of 900 900 ft/sec. Recall that projectiles are modeled by the function h(t)=−16t2+v0t+y0 h ( t ) = − 16 t 2 + v 0 t + y 0 . Write a quadratic equation to model the projectile's height h(t) h ( t ) in feet above the ground after t seconds.