In a similar way to the player controller, we need to move the bullet. We use the same equation for the motion and the same lines of code. However, we need to make the movement happen only on the y-axis; there is no clamp, and the bullet moves regardless of the input of the player. Here is the final code, which shouldn't be hard for you to understand:

    void FixedUpdate() { 
        //Get the new position of our bullet 
        var y = transform.position.y + Time.deltaTime * speed; 
 
        //Set the position of our bullet through the RigidBody2D component (since we are using physics) 
        rigidBody.MovePosition(new Vector2(transform.position.x, y)); 
    }