The Quadratic Formula - Defintion & Examples

Professional soccer player Mia Hamm can kick a soccer ball with the initial velocity $v_{0}$ of $27$ meters per second! Assuming she kicks the ball from ground level ($h_{0}=0$), use the equation $h(t)= -\frac12gt^2+v_{0}t+h_{0}$ to find out how many seconds pass before the ball hits the ground. Use $9.8$ as the gravitational acceleration $g$.