gistfile1.cs

  class Program
    {
        static void Main()
        {

                double initialVelocity_x = 20;
                double initialVelocity_y = 14; 
                physics.Ball ball=
                    new physics.Ball(initialVelocity_x, initialVelocity_y);
                double time=ball.CalculateReturnTime();
                Console.WriteLine("return time={0}", time);
                ball.GetPositionUnderGravityAtTime(1.1);
                Console.WriteLine("x={0},y={1}", ball.X, ball.Y);

               
        }
    }