Modify the move method to accelerate the boxBall based on the gravity constant.

Question

Modify the move method to accelerate the boxBall based on the gravity constant.
Hint 1: Acceleration/deceleration is a change in ySpeed value
Hint 2: ySpeed is reverse of normal physics, negative is up, positive is down

public class BoxBall {   

private int diameter;
private float xPosition;
private float yPosition;
private float xSpeed;
private float ySpeed;// initial downward speed
private static final int GRAVITY = 3; // effect of gravity
  
/**
* Constructor for objects of class BoxBall
*
* @param xPos the horizontal coordinate of the ball
* @param yPos the vertical coordinate of the ball
* @param xSpeed the horizontal speed of the ball
* @param ySpeed the vertical speed of the ball
* @param ballDiameter the diameter (in pixels) of the ball
*/
public BoxBall(int xPos, int yPos, int xSpeed, int ySpeed, int ballDiameter)
{
xPosition = xPos;
yPosition = yPos;
this.xSpeed = xSpeed;
this.ySpeed = ySpeed;
diameter = ballDiameter;
}

public void move() {

//accelerate based on gravity constant
  
// compute new y position
this.ySpeed -= yPosition;

}

Explanation / Answer

public class BoxBall {
private int diameter;
private float xPosition;
private float yPosition;
private float xSpeed;
private float ySpeed;// initial downward speed
private static final int GRAVITY = 3; // effect of gravity
  
/**
* Constructor for objects of class BoxBall
*
* @param xPos the horizontal coordinate of the ball
* @param yPos the vertical coordinate of the ball
* @param xSpeed the horizontal speed of the ball
* @param ySpeed the vertical speed of the ball
* @param ballDiameter the diameter (in pixels) of the ball
*/
public BoxBall(int xPos, int yPos, int xSpeed, int ySpeed, int ballDiameter)
{
xPosition = xPos;
yPosition = yPos;
this.xSpeed = xSpeed;
this.ySpeed = ySpeed;
diameter = ballDiameter;
}
public void move() {
//accelerate based on gravity constant
this.ySpeed = this.ySpeed + GRAVITY; // v = u + at assuming move is called every second
// compute new y position
this.yPosition -= (this.ySpeed - 0.5*GRAVITY);
}
}

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