A projectile is launched from ground level with an initial velocity of Vo feet per second. Neglecting air resistance, its height in feet t seconds after launch is given by s= - 16t- + vat. Find the time(s) that the projectile will (a) reach a height of 96 ft and (b) return to the ground when vn = 112 feet per second. (a) Find the time(s) that the projectile will reach a height of 96 ft when vo = 112 feet per second. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. seconds (Use a comma to separate answers as needed.) O B. The projectile does not reach 96 feet. (b) The projectile returns to the ground after second(s). 4