The ball, motionlessly lying on a table in a carriage of a train moving uniformly and rectilinearly, suddenly rolled forward in the direction

The ball, motionlessly lying on a table in a carriage of a train moving uniformly and rectilinearly, suddenly rolled forward in the direction of train movement. What can be said about the speed of the train at this point in time?

1. At the moment in question, the train braked (speed decreased).
2. The movement of the ball is due to the phenomenon of inertia.

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