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

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

Give reasons : It is advised to tie any luggage kept on the roof of the bus with a rope .

Explain the reasons for the following (a) Why dust comes out of carpet when it is beaten with a stick ? (b) Luggage kept on the roof of a bus is tied with a rope. (c ) Why a pace bowler in cricket runs from a long distance before he bowls ?

Explain the reasons for the following (A S_(1)) (a) Why dust comes out of carpet when it is beaten with a stick ? (b) Laggage kept on the roof of a bus is tied with a rope. (c ) Why a pace bowler in cricket tuns from a long distance before he bowls ?

Why it is not advised to take analgesic empty stomach ?

Why it is not advised to take analgesic empty stomach ?