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Q.

Which of the following is the example of variable mass system?

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a

A car moving

b

 A man walking

c

A rocket taking off

d

A bicycle moving

answer is B.

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Detailed Solution

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A variable-mass system is exemplified by rockets, which shed considerable amounts of mass as fuel during flight.

In case of a rocket taking off, the mass of the fuel is large and cannot be neglected. As the rocket starts moving, a large amount of fuel is getting burnt out from the nozzle, hence the total mass decreases. Hence it is a variable mass system.

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