Question

explain with reference to inertia: a passenger in a bus tends to fall backward when it starts suddenly.

Answer 1

When the bus starts suddenly the lower part of the person which is touching the bus comes in motion but the upper part of the body due to inertia of rest doesn't move at once therefore the passenger falls backwards

Answer 2

it is due to inertia of rest
according to this a body tends to remain rest unless it is compelled by an external force to move.this is known as inertia of rest
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