B) After ______ seconds the projectile returns to the ground?

A projectile is launched from ground level with an initial velocity of Va feet per second. Neglecting air resistance, its height in feet t seconds after launch is given by s = 16!2 + vot. Find the time(s) that the projectile will (a) reach a height of 160 ft and (b) return to the ground when v0 = 112 feet per second. (a) Find the time(s) that the projectile will reach a height of 160 ft when v0 = 112 feet per second. Select the correct choice below and, if necessary, ll in the answer box to complete your choice. 0 A- D seconds (Use a comma to separate answers as needed.)