plz help, how to get an object to freeze in mid air 2D

Well the title pretty much speaks for itself,I want when you press a key .the object will freeze in the air at that position until you let down the key.But the problem is that i dont know how to make the object freeze.I tried rb.gravityScale = 0; , and on the rigidbody without 2d i tried rb.useGravity=false; AND it worked but in rigidbody there is no gravity scale pharameter and i need that gravityScale = 2.SO i dont know what to do,here is the beginning of the script; Thx for your time

private Rigidbody2D rb;
void Start()
{
rb = GetComponent<Rigidbody2D>();
}
void Update()
{
if (Input.GetKey(KeyCode.Space))
{

}
}

 

nvm i got it to work
if (Input.GetKey(KeyCode.Space))
{
m_Rigidbody.constraints = RigidbodyConstraints2D.FreezeAll;
}
else
{
m_Rigidbody.constraints = RigidbodyConstraints2D.None;
}