Question

luggage kept on the roof of a bus is tied with a rope explain the reason for the following

Answer 1

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A luggage is usually tied with a rope on the roof of buses. When a moving bus suddenly stops, the luggage on its roof tends to continue in the state of motion due to inertia of motion.Thus, to avoid the falling of the luggage, it is tied with a rope on the roof of a bus.
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Answer 2

so that they may be intact and do not trip off the bus when it is moving or vibrating due to its engine