Answers

2014-10-11T20:55:22+05:30
This is because of inertia of motion..
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2014-10-11T21:07:47+05:30
It is because of rest of inertia.when the bus is in motion the body will be in motion but when bus stops but the body tends to be in motion therefore falls forward of their seats. 
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it is due to inertia of motion, not rest of inertia.
yaaa sry its inertia of motion