​

let x = 200;

let y = 50;

let mass = 20;

let vy = 1;

let ay = 0.75;

​

function setup() {

  createCanvas(400, 400);

  ay = mass * 0.015

}

​

function draw() {

  background(0);

  ball(); 

  bounce();

  print(y);

}

​

function ball() {

  noFill();

  stroke(255);

  strokeWeight(4);

  circle(200, y, mass);

}

​

function bounce() {

  if (y > height) {

    vy *= -0.6;

    y = height;

  } 

  vy += ay;

  y += vy;

​

}