Eyjafjallajokull is a volcano in Iceland. During a recent eruption, the volcano spewed out copious amounts of ash. One small piece of ash was ejected from the volcano with an initial velocity of 368ft/sec. The height H, in feet, of our ash projectile is given by the equation: H=-16t^2+368t, where t is the time, in seconds. The graph of this equation will be a parabola. We will assume that the volcano has no height. i.e H=0 at t=0. When does the ash projectile reach its maximum height? What is its maximum height? When does the ash projectile return to the ground?