import java.awt.*;

public class Ball {

    public static void main(String[] args) {
        DrawingPanel panel = new DrawingPanel(600, 600);
        panel.setBackground(Color.MAGENTA);
        Graphics g = panel.getGraphics();
        
        int ball1X = 100;
        int ball1Y = 0;
        int ball1v0 = 25;
        
        for (double t = 0.0; t < 15; t += 0.1) {
            double displacement = calculateDisplacement(ball1v0, t, 9.81);
            g.drawOval(ball1X, ball1Y + (int)displacement, 10, 10);
            panel.sleep(50);
        }
    }
    
    public static double calculateDisplacement(int v0, double t, double a) {
        double displacement = v0 * t + .5 * a * Math.pow(t, 2);
        return displacement;
    }
}