Question

why it is advised to tie any luggage kept on the roof of a bus with a rope​

Answer 1

Answer:

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

because the luggage may fall down at turning point due to inertia of motion.