void FixedUpdate()
    {
            myRigidbody.velocity = (new Vector2 (PlayerSpeed * Input.GetAxis("Horizontal"),PlayerSpeed * Input.GetAxis("Vertical")));
    }

void OnCollisionEnter2D(Collision2D collision)
    {

        if (collision.transform.tag == "Border")
        {
            Debug.Log("Border");
            myRigidbody.velocity = Vector2.zero;
            myRigidbody.angularVelocity = 0f;
        }
    }