When a train stops suddenly, passengers in the running train feel a...

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When a train stops suddenly, passengers in the running train feel an instant jerk in the forward
\( \mathrm{P} \) direction because
(1) The back of seat suddenly pushes the
W. passengers forward
(2) Inertia of rest stops the train and takes the body forward
(3) 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
(4) Nothing can be said due to insufficient data
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