How do I detect an increase in movement then a sudden stop using the device's accelerometer?

I'm trying to detect a motion that you would get from bumping two phones with each other.

My question is, is an accelerometer the right sensor for this?

If so, how would I implement it?

Otherwise, what sensor should I use and in what way should I use it?

According to the guide at https://developer.android.com/guide/topics/sensors/sensors_overview, TYPE_LINEAR_ACCELERATION seems like the right one to use, however I can't figure out how to use it.

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