Ok some updates. i am now on to car physics but am kind of stuck on how to proceed. I found a few forum posts esp. this one where the vehicle is mostly setup using low level ammo.js functions and objects.
To begin with i took the babylon.js getting started village demo car model to add physics to it but that gives a warning message because the car chassis and wheels are linked to each other but ammo.js wants the objects to be unlinked.
I also found [this URL] (WebGL physics-based car using Babylon.js and Oimo.js) which shows how to do physics in babylon.js using oimo.js but it uses motor joint whcih is not provided in ammo.js.
Any ideas on what is the best and simplest approach for car physics that I should take for my tutorial?