During a recent eruption, a volcano spewed copious amounts of ash. one small piece of ash was ejected from the volcano with an initial velocity of 368 ft/sec. the height h, in feet, of our ash projectile is given by the equation: h = -16t^2 + 368t

question 1. when does the ash projectile reach the its maximum height? t=?
question 2. what is its maximum height?
question 3. when does the ash projectile return to the ground?