[c sharp] why isn't my player dying when it touches the truck?

in this script i dont know if i have a problem but i want it so when my player touches the truck it dies... the truck and player both have rigidbodiesand box colliders please help!

Sccript on player:

using UnityEngine; using System.Collections;

public class jump : Enitity { void OnCollisionEnter2D(Collision2D coll) { if (coll.gameObject.tag == "truck") Destroy(gameObject); } public float speedForce = 50f; public Vector2 jumpVector;

 void Update()
 {
     Movement();
 }

 void Movement()
 {
     if (Input.GetKey(KeyCode.D))
     {
         transform.Translate(Vector2.right * 8f * Time.deltaTime);
     }
     if (Input.GetKey(KeyCode.A))
     {
         transform.Translate(Vector2.left * 8f * Time.deltaTime);
     }
     if (Input.GetKey(KeyCode.W))
     {
         transform.Translate(Vector2.up * 8f * Time.deltaTime);
     }
 }

}

love if someone can help cause im new (●´ω｀●)