text: class Ball {
  	constructor(x, y, width, height, angle) {
  	  var options = { 
  		density: 5, 
  		frictionAir: 0.04};
  
  	this.body = Bodies.rectangle(x, y, width, height, options);
  	this.width = width;
  	this.height = height;
  	World.add(world, this.body);
  	}
    
  	display() {
  	  var angle = this.body.angle;
  	  push();
  	  translate(this.body.position.x, this.body.position.y);
  	  rotate(angle);
  	  stroke("white");
  	  fill("brown");
  	  ellipse(0, 0, this.width, this.height);
  	  pop();
  	}
    }