Assets/Scripts/ControllerScript.cs(17,72): error CS0029: Cannot implicitly convert type `float' to `UnityEngine.Rigidbody2D'

using System.Collections;
using UnityEngine;

public class ControllerScript : MonoBehaviour {

public float maxSpeed = 10f;
bool facingRight = true;

void Start () {
	
}

void FixedUpdate () {

    float move = Input.GetAxis("Horizontal");

    Rigidbody2D myRigidbody = GetComponent<Rigidbody2D>().velocity.y;

    if (move > 0 &&!facingRight)
        Flip ();
    else if (move < 0 && facingRight)
        Flip ();
}
void Flip()
{
    facingRight = !facingRight;
    Vector3 theScale = transform.localScale;
    theScale.x *= -1;
    transform.localScale = theScale;
}

}

im watching at the moment a tutorial about animations. But im getting this error:

Assets/Scripts/ControllerScript.cs(17,72): error CS0029: Cannot implicitly convert type float' to UnityEngine.Rigidbody2D’

HEEEEEELP!

Line 11, you are declaring a variable of type Rigidbody2D, but attempting to set it to the velocity float.