问Java:方法总是返回相同的结果

EN

import javax.swing.JOptionPane;
public class fallingDistance {

    public static void main(String[] args){

        String input;
        double time;

        input = JOptionPane.showInputDialog("Enter the time in seconds: ");
        time = Double.parseDouble(input);
        System.out.println(time);
        for(int x=1; x<=10; x++){
            JOptionPane.showMessageDialog(null, "The falling distance is: " + calculate(x) + "m.");
        }

    }

    public static double calculate(double time){
        double g = 9.8, a=0.5;
        double distance = (a*g) * (Math.pow(time, 2.0));
        JOptionPane.showMessageDialog(null, distance);
        return (distance);
    }
}