This is the first screen you see when you start the Car-G-Crash application.

Here you can select crashtype or get general information about the application.

Collision with merge means when the cars, after crash is one object, i.e the cars is so crashed together that they are unseparable.

Collision with bounce is when the cars after the crash bounce away from each other and you know the speed for one of the cars.

Here you enter the speed before crash and the weight of the cars. You select speedtype in Km/h or in Mph.

You can of course select the direction of the crash.

As an average we have seen that crastime is about 0.1 sec and we use this in all calculations.

When you are finished you just tap the done button.

Here you see the page for bounce-crash.

The difference here is that you also enters one of the cars speed after the crash.

This is an example

And the result speaks for itself.

If the acceleration is less than 0, as in this case, it means that the object have changed to opposite direction.

In this example the Object A is slowing down but Object B is going backwards!!!

Here is the info page