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Assets/Scripts/Breakable.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Breakable : MonoBehaviour
+{
+    [SerializeField] private GameObject _debrisRoot;
+    [SerializeField] private float _minFallSpeed = 2f;
+    [SerializeField] private float _explosionForce = 100f;
+    [SerializeField] private float _explosionRadius = 2f;
+    [SerializeField] private float _disappearTime = 3f;
+
+    private Rigidbody _rb;
+    private bool _broken = false;
+
+    void Start()
+    {
+        _rb = GetComponent<Rigidbody>();
+        _debrisRoot.SetActive(false);
+    }
+
+    void OnCollisionEnter(Collision collision)
+    {
+        if (_broken) return;
+        if (_rb.velocity.y < -_minFallSpeed)
+            Break(collision.GetContact(0).point);
+    }
+
+    void Break(Vector3 contactPoint)
+    {
+        _broken = true;
+        _debrisRoot.SetActive(true);
+        _debrisRoot.transform.parent = null;
+
+        Rigidbody[] pieces = _debrisRoot.GetComponentsInChildren<Rigidbody>();
+        foreach (var piece in pieces)
+        {
+            piece.velocity = _rb.velocity;
+            piece.AddExplosionForce(_explosionForce, contactPoint, _explosionRadius);
+        }
+
+        Destroy(_debrisRoot, _disappearTime); 
+        Destroy(gameObject);                
+    }
+}