public class BallTossSimulator {

    public double run (double stopTime, double initVelocity)
    {
	// Initialize variables.
        double a = 9.8;
        double vy = initVelocity;
        double y = 0;
        double t = 0;
        double delT = 0.01;

	while (true) {
	    // Update time.
	    t += delT;

            // Increase velocity accordingly.
	    vy = vy - delT * a;

            // Increase distance according to velocity.
            y = y + delT * vy;

	    if ((t >= stopTime) || (y <= 0)) {
                break;
	    }
	}

        return y;
    }

}