sketch.js

var car, wall, speed, weight;

function setup() {
  createCanvas(1600,400);

  speed = random(55,90);

  weight = random(400,1500);

  car = createSprite(50, 200, 50, 50);
  car.shapeColor = "green";
  car.velocityX = speed;

  wall = createSprite(1200, 200, 60, height /2);
  wall.shapeColor = (80,80,80);
}

function draw() {
  background(0,0,0); 
  if(wall.x - car.x < (car.width + wall.width) /2) 
  {
    car.velocityX = 0;
    var deformation = 0.5 * weight * speed * speed / 22509;
    if(deformation > 180)
    {
      car.shapeColor = color(255,0,0);
    }

    if(deformation < 180 && deformation > 100)
    {
      car.shapeColor = color(230,230,0)
    }

    if(deformation < 100)
    {
      car.shapeColor = color(0,255,0);
    }
  }
  drawSprites();
}