Particles to play after an object hits the ground (Unity 5)

I have a bomb that is being dropped and I want it to disappear and an explosion particle effect (the one that is in the unity standard assets> particle systems) to come after it. I have it so when the bomb hits the ground it disappears, but I have researched and couldn’t find anything that relates in the way I need it.

This is my script now (nothing really) and I would prefer it to be added onto this, but if it’s not possible it’s ok.

using UnityEngine;
using System.Collections;

public class Destroyoncollision : MonoBehaviour {

void OnCollisionEnter(Collision otherObj) {
    Destroy(otherObj.gameObject);
    }
}

It’s easy. You need a variable that references the prefab object you want to instantiate when the bomb explodes. In your case, this prefab would be the gameobject that holds the ParticleSystem. It’s probably a good idea to destroy the explosion object after a few seconds so you scene doesn’t get cluttered with invisible objects that are no longer needed.

public GameObject explosionPrefab;//Drag the particlesystem object here in the inspector

void OnCollisionEnter(Collision otherObj) {
     
          GameObject explosionObject = Instantiate(explosionPrefab, otherObj.transform.position, Quaternion.identity) as GameObject;
          explosionObject (explosionObject , 5f);
          Destroy(otherObj.gameObject);
     }
 }