3. A cannon ball is fired off a 6m high cliff with initial speed 9.9m at an angle of 45 above the horizontal and accelerates downward at 9.8m. How far does the ball travel horizontally before it hits the ground? (Hint: 49.92 = 9.8) You need to calculate this quantity in the following way using the tools you learned about in this class: (a) Set up a reference frame with a 2 dimensional coordinate system. (b) Present a vector equation and tell the reader if you are using a hypothesis or definitions of kinematic terminology (c) Present an system of equations that is equivalent to your vector equation (d) Eliminate one of the two unknowns (which you will probably nickname r and t) (e) Calculate, using the fact that the solutions to ax + br + c = 0 (a quadratic equation) are byvb2-4ac (the quadratic formula). 2a Correct quantity: 14m in 2.0s