get rigidbody component unity

//The Variable
Rigibody rb;

void Start()
{
	rb = GetComponent<Rigidbody>();
}

 using UnityEngine; using System.Collections;  public class Test : MonoBehaviour {     private Rigidbody rb;     void Awake(){          rb = gameObject.GetComponent<Rigidbody>();     }       private void Example() {         rb.velocity = some value;     } }

public Rigidbody rigidbody;