An example of variable mass system is _____

Category: QuestionsAn example of variable mass system is _____
Editor">Editor Staff asked 1 year ago

An example of variable mass system is _____
(a) A car moving
(b) A rocket taking off
(c) A bicycle moving
(d) A man walking
I had been asked this question in examination.
My doubt is from Newton’s Second Law of Motion topic in division Laws of Motion of Physics – Class 11
Select the correct answer from above options 
Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

1 Answers
Editor">Editor Staff answered 1 year ago

Correct choice is (b) A rocket taking off
To elaborate: 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.