A water balloon slingshot launches its projectiles essentially from ground level at a speed of 25.0 m/s. a) At what angle should the slingshot be

A water balloon slingshot launches its projectiles essentially from ground level at a speed of 25.0 m/s. a) At what angle should the slingshot be aimed to achieve its maximum range? b) If shot at the angle you calculated in part (a), how far will the water balloon travel horizontally? c) For how long will the balloon be in the air? (You can ignore air resistance.)