1. The problem statement, all variables and given/known data A ball of mass 0.9kg is shot from a slingshot at an angle of 60° from the ground. The slingshot is sitting 1m above the ground. The elasticity of the slingshot is k = 700N/m. Take gravity = 10m/s^2 Air resistance must be taken into account also. Use the formula D = ( C*P*(U^2)*A )/2 D = Drag C = 1 P = 1.2 U = 13.94 A = 0.03142 How far (in the x direction) has the ball travelled when it hits the ground?? 2. Relevant equations F = ma E = 0.5mv^2 d = vt d = vt + 0.5at^2 D = ( C*P*(U^2)*A )/2 (D = Drag) 3. The attempt at a solution The following calculations have already been found: Initial force in Ball = 350N Initial Energy in Ball = 87.5J Time of flight without air resistance = 5.5sec X-distance travelled without air resistance = 17.4m Drag = 3.66 kg/s I don't know how to apply the air resistance (drag) formula/calculation to what I have found.