Why do passengers in the bus tend to fall back when it starts suddenly

1.	Why do passengers in the bus tend to fall back when it starts suddenly
Answer» Due to inertia of rest. because when the BUS is STOPPED. there is NOTHING any motion on the bus but suddenly bus start and start to move but we human are STILL in rest so it gives us a force TOWARDS back and set us in motion with bus.

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Why do passengers in the bus tend to fall back when it starts suddenly

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