Determine Distance The Object Falls In Specified Time Period

When an object is falling because of gravity, the following formula can be used to determine the distance the object falls in a specified time period:

d = 1/2 gt^2

The variables in the formula are as follows: d is the distance in meters, g is 9.8, and t is the amount of time, in seconds, that the object has been falling.

Write a method named FallingDistance that accepts an object's falling time (in seconds) as an argument. The method should return the distance, in meters, that the object has fallen during the time interval. Demonstrate the method by calling it in a loop that passes the values 1 through 10 as arguments, and displays the return value.

import java.util.Scanner;
import java.text.DecimalFormat;
 public class FallingDistance
{
public static void main(String[] args) {
DecimalFormat num = new DecimalFormat("#,###.00");
Scanner keyboard = new Scanner(System.in);
double fallingTime;

[Code] ....

My program runs, but no matter what falling time I enter, I get the same numbers. What am I doing wrong?