public class BallTossExercise3 {

    public static void main (String[] argv)
    {
        for (double initVelocity=50; initVelocity<500; initVelocity+=50) {
            // Try this initial velocity:
            double heightReached = getMaxHeight (initVelocity);
            if (heightReached > 1000) {
                // If we've exceeded 1000, then stop.
                System.out.println ("initV=" + initVelocity + "  height=" + heightReached);
                break;
            }
        }
    }
    

    static double getMaxHeight (double initVelocity)
    {
        // Make an instance of the simulator.
        BallTossSimulator2 sim = new BallTossSimulator2 ();

        // Find the height reached at t=1 and t=2
        double stopTime = 1;
        double prevY = sim.run (stopTime, initVelocity);
        stopTime = 2;
        double nextY = sim.run (stopTime, initVelocity);

        while (nextY > prevY) {
            // As long as y(t+1) > y(t), repeat.
            prevY = sim.run (stopTime, initVelocity);
            stopTime = stopTime + 1;
            nextY = sim.run (stopTime, initVelocity);
        }

        // Now we're sure that y(t+1) < y(t)
        System.out.println ("initV=" + initVelocity + "  stopTime=" + stopTime + " prevY=" + prevY + " nextY=" + nextY);
        return prevY;
    }

}