Hi Pupil Here is Your Answer ::
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The tendency of a body to oppose any change in its state of rest is known as inertia of rest.
Example :
1 ) A person standing in a bus Falls backward when the bus suddenly starts moving forward.
Reason》When the bus Moves, the lower part of his party begins to move along with the bus by the upper part of his body continues to remain at rest due to inertia of rest.
That is why, a person Falls backward when the bus suddenly starts.
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Hope this helps . . . . . .