Awater balloon slingshot launches its projectiles essentially from ground level at a speed of 27.5 m/s . (you can ignore air resistance.)

A ) A range:
R = v² sin 2 α / g
The maximum range is when sin 2 α = 1, or when: 2 α = 90°
α = 45°
B ) R = 27.5² · 1 / 9.81 = 77 m
C ) Time:
T = 2 v sin α / g = 2 · 27.5 · sin 45° / 9.81 =
= 2 · 27.5 · 0.7 / 9.81 = 3.92 s 

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /