Answers

2015-01-03T19:13:15+05:30
Inertia
ie the body moves ahead if the train stops suddenly
and the body moves behind if the train starts 
the same is appylable in a car or any vehical

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2015-01-03T19:18:25+05:30
Inertia,note that the person tends to fall backward/forward when the train accelerates/decelerates
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