LibGdx physics independent from framerate

I am working on a simple platform games like Super Mario. I am using Java with the LibGdx engine. I have a problem with physics being independent of the framerate. In my game the character can do a jump, the jump height is apparently dependent of the framerate. On my desktop the game runs fine, it runs at 60 frames per second. I also tried the game on a tablet on which it ran at a lower fps. What happened was that the character could jump much higher than when I jumped on the desktop version. I have already read some articles about fixing the timestep, I do understand it, but not enough to apply it to this situation. I just seem to be missing something. Here is the physics part of the code: ``` protected void applyPhysics(Rectangle rect) { float deltaTime = Gdx.graphics.getDeltaTime(); if (deltaTime == 0) return; stateTime += deltaTime; velocity.add(0, world.getGravity()); if (Math.abs(velocity.x) < 1) { velocity.x = 0; if (grounded && controlsEnabled) { state = State.Standing; } } velocity.scl(deltaTime); //1 multiply by delta time so we know how far we go in this frame if(collisionX(rect)) collisionXAction(); rect.x = this.getX(); collisionY(rect); this.setPosition(this.getX() + velocity.x, this.getY() +velocity.y); //2 velocity.scl(1 / deltaTime); //3 unscale the velocity by the inverse delta time and set the latest position velocity.x *= damping; dieByFalling(); } ``` A jump() function gets called and adds a variable jump_velocity = 40 to the velocity.y. The velocity is used in the collision detection.