Aperson sitting loosely in the bus falls backward when the bus suddenly starts moving ?

Hi Pupil Here's Your Answer :::

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Answer = When the bus suddenly starts moving, the lower part of the passenger's body begins to move along with the bus while the upper part tends to remain at the rest due to the inertia of rest. That is why, a passenger standing or sitting loosely in a bus Falls backward when the bus suddenly starts moving.

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Hope this helps .. .. .. .. ..