Hello

In the commercial edition the phisics engine can be used for 1 object only.
Suppose I create a few istances of the same entity, for example a few cars in a racing game.
Can I use the engine for all the cars or one only?

You can use only one physic object. This means only one model can use it. For example: You've two stones with the same action, which is using physics. Only one of them will work.

Use NEWTON if you need many physic objects.