y = 50

speed = 1

gravity = 0.3

​

function setup() {

  createCanvas(400, 300);

}

​

function draw() {

  background(220);

  y = y + speed

  speed = speed + gravity

  if (y > height) {

    speed = speed * -0.8

  }

  stroke(0)

  fill(175)

  ellipse(x, y, 32, 32)

}