Prove that the trajectory of a projectile is parabolic, having the form y = ax + bx². To obtain this expression, solve the equation x = v_0xt for t and substitute it into the expression for y=v_0yt-(1/2)gt² (These equations describe the x and y positions of a projectile that starts at the origin.) You should obtain an equation of the form y = ax + bx² where a and b are constants.