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 + Vot. Find the time(s) that the projectile will (a) reach a height of 288 ft and (b) return to the ground when vo = 144 feet per second. (a) Find the time(s) that the projectile will reach a height of 288 ft when vo = 144 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 288 feet. (b) The projectile returns to the ground after second(s).

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