public class UsesConstants {
  static final double g=9.8; // gravitation in meters per second^2
  public static void main (String[] args)
    {
    double seconds=3.8;
    double distance;

    System.out.println(g + " meters per second squared");
    distance = Math.pow(seconds,2)*g/2;
    System.out.println("In " + seconds + " seconds, we fall " +
		       distance + " meters.");
    }
  }