A toy rocket is shot vertically into the air from a launching pad 8 feet above the ground with an initial velocity of 80 feet per second. The height​ h, in​ feet, of the rocket above the ground at t seconds after launch is given by the function h left parenthesis t right parenthesis equals negative 16 t squared plus 80 t plus 8. How long will it take the rocket to reach its maximum​ height? What is the maximum​ height?