/** Simulating dropping a ball from the top of the Washington
* Monument. The program outputs the height of the ball each
* second until the ball hits the ground.
*
* Taken from Core Web Programming from
* Prentice Hall and Sun Microsystems Press,
* http://www.corewebprogramming.com/.
* © 2001 Marty Hall and Larry Brown;
* may be freely used or adapted.
*/
public class DropBall {
public static void main(String[] args) {
int time = 0;
double start = 550.0, drop = 0.0;
double height = start;
while (height > 0) {
System.out.println("After " + time +
(time==1 ? " second, " : " seconds,") +
"the ball is at " + height + " feet.");
time++;
drop = freeFall(time);
height = start - drop;
}
System.out.println("Before " + time + " seconds could " +
"expire, the ball hit the ground!");
}
/** Calculate the distance in feet for an object in
* free fall.
*/
public static double freeFall (float time) {
// Gravitational constant is 32 feet per second squared
return(16.0 * time * time); // 1/2 gt^2
}
}