Moving object up/down from center(?)

Unity Engine
1

Hello, guys, I’m stuck on problem which I can’t resolve without somebody’s help. I will be very glad if someone will help me.

I need to make some moving object, i’ve write the script but the object is go down from starting position and then is repeating the same. I need to moving object from center for the same distance up and down.

public float speed = 0;
    public float switchTime = 2;
    void Start()
    {
       
        GetComponent<Rigidbody2D>().velocity = Vector2.up * speed;
        if (Vector2.Equals)

        InvokeRepeating("Switch", 0, switchTime);
    }

    void Switch()
    {
        GetComponent<Rigidbody2D>().velocity *= -1;
    }
2

Pretty sure Line 7 is preventing your script from compiling.