When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because
The back of seat suddenly pushes the passengers forward
Inertia of rest stops the train and takes the body forward
Upper part of the body continues to be in the state of motion whereas the lower part of the body in contact with seat remains at rest
Nothing can be said due to insufficient data
When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because
This is due to inertia. When the speeding bus stops suddenly, lower part of the body comes to rest while the upper part of the body tends to maintain uniform motion. Hence, the passenger's are thrown forward.
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