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Q.

When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because

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a

The back of seat suddenly pushes the passengers forward.

b

Inertia of rest stops the train and takes the body forward

c

Upper part of the body continues to be in the state of motion where as the lower part of the body in contact with seat remains at rest

d

Nothing can be said due to insufficient data

answer is C.

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Detailed Solution

A train stops suddenly, and passengers in the running train feel an instant jerk in the forward direction because the Upper part of the body continues to be in the state of motion whereas the lower part of the body in contact with the seat remains at rest

This is called The inertia of rest which states   the " Tendency of a body to remain in the state of rest." 

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When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because