IIT JAM
Himanshu Pandey Asked a Question
April 19, 2020 1:45 ampts 30 pts
  • IIT JAM
  • Physics (PH)

Mechanics conceptual

If train is moving with speed xkm/h and we start removing it's coaches the velocity of Train remains same "but why "the mass is countinosly decreasing and the engine is applying the same force
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  • Abhishek singh Best Answer
    here is the correct demonstration. Thanks for pointing out. Do ask doubts if any.
    • cropped119960200896155583.jpg
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  • Himanshu Pandey
    Sir in your demostration how you cancelled out M with m2 for obtaining V2=V
    • cropped5708246332272372807.jpg
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    Abhishek singh
    Thanks for pointing out. I have attached the corrected one.
  • Ruby negi thankyou
    this is the case of conservation of linear momentum, so velocity of train will remain same even after the removal of it's coaches
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  • Abhishek singh
    I would like to make two arguments: 1) if you are assuming no friction, then the velocity of train will remain same for infinite time. 2) if you are assuming friction, then also th...
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  • Shanu arora thankyou
    Answer : Even after the coaches are being removed, the engine produces same force, actually this is a hypothetical condition which says that F to remain constant for the ease of qu...
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