class Ball{
  color c;
  float x;
  float y;
  float diam;
  float speed = 0;
  float gravity = 0.5;
  
  Ball(color tempC, float tempXpos, float tempYpos){
    c = tempC;
    x = tempXpos;
    y = tempYpos;
  }
  
  void display(){
    stroke(0);
    fill(c);
    ellipseMode(CENTER);
    ellipse(x,y,15,15);
  }
  
  void move(){
    y = y + speed;
    speed = speed + gravity;
    if (y > height){
      speed = speed * -0.95;
    }
  }
}