update description for collisions challenge

Author: shiffman

content/videos/challenges/184-elastic-collisions/index.json

@@ -1,12 +1,12 @@
 {
   "title": "Elastic Collisions",
   "videoNumber": "184",
-  "description": "",
-  "videoId": "",
+  "description": "What happens when two circles collide in a p5.js canvas? In this video, I examine the math and implement idealized elastic collisions in a physics simulation. This video supplements the Nature of Code book series in Chapter 6 which uses 3rd party physics libraries to handle collisions rather than a direct implementation.",
+  "videoId": "dJNFPv9Mj-Y",
   "nebulaSlug": "codingtrain-coding-challenge-184-elastic-collisions",
-  "date": "2024-07-12",
+  "date": "2024-07-13",
   "languages": ["p5.js", "JavaScript"],
-  "topics": ["elastic collisions", "physics simulation"],
+  "topics": ["collisions", "physics simulation"],
   "canContribute": true,
   "relatedChallenges": ["67-pong", "98-quadtree", "139-calculating-digits-of-pi-with-collisions", "176-buffon-needle"],
   "timestamps": [
@@ -15,7 +15,7 @@
     { "time": "1:22", "title": "Review background material" },
     { "time": "4:15", "title": "Collision Resolution" },
     { "time": "5:42", "title": "Start Coding" },
-    { "time": "8:48", "title": "Add collide function" },
+    { "time": "8:48", "title": "Add collide() function" },
     { "time": "10:17", "title": "Momentum and kinetic energy" },
     { "time": "14:15", "title": "Line of impact" },
     { "time": "16:44", "title": "Add the formulas" },