Passengers which are facing forward in the direction that train is moving, their bodies will move forward in application of sudden stop of train.
Force of inertia is the force which acts in the opposite direction of the force of acceleration acting on the body.
Given infroamtion-
The passengers are facing forward in the direction that the train is moving.
The train comes to a sudden stop.
Lets see what happens step wise-
Hence, passengers which are facing forward in the direction that train is moving, their bodies will move forward in application of sudden stop of train.
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