//  Scott DeRuiter      10/8/2002
//  Projectile.java
//  Simulation of a projectile being fired into the air.
//  7/15/2011 - Greenstein: Changed TextReader to Scanner

import java.util.Scanner;

public class Projectile   
{
	private int seconds;
	private double height, velocity;

	public Projectile ( )  
	{
		seconds = 0;
		height = velocity = 0.0;
	}

	public static void main ( String [] args )   
	{
		Projectile rock = new Projectile ( );

		rock.GetVelocity ( );
		rock.ShowAltitude ( );
	}

	public void GetVelocity ( )   
	{
		Scanner keyinput = new Scanner ( System.in );

		System.out.print ( "\n\nEnter the initial velocity in ft/sec^2 ->   " );
		velocity = keyinput.nextDouble ( );
	}

	public void ShowAltitude ( )   
	{
		if ( velocity > 0.0 )   
		{
			System.out.println ( "\n\nSeconds     Height" );
			while ( height >= 0.0 )   
			{
				System.out.println ( seconds + "         " + height );
				seconds++;
				height = -16.0 * seconds * seconds + velocity * seconds;
			}
		}
	}
}