Q.

Why do people sitting on a train move backwards when the train suddenly starts?

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a

Due to inertia

b

Due to momentum

c

 Due to velocity

d

Due to force

answer is A.

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Detailed Solution

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  • Due to inertia people sitting on a train move backwards when the train abruptly starts.
  • Inertia is the tendency of an object at rest to remain at rest, or of a moving object to maintain constant speed in the same direction.
  • People in the train were initially at rest with the train, and when the train starts moving, the people in the train are still at rest and hence appear to move backwards with respect to the train. This is called Inertia of rest.
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