unity how to set rigidbody velocity

GetComponent<Rigidbody>().velocity = Vector3.zero;
GetComponent<Rigidbody>().angularVelocity = Vector3.zero;

Vector3 velocity = new Vector3(10f/*x*/, 10f/*y*/, 10f/*z*/);
GetComponent<Rigidbody>().velocity = velocity;

//for rigidbody2D
GetComponent<Rigidbody2D>().velocity =new Vector2(40,0);