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when speed is 10kmph east, a train appears to be moving 'north-east'.when i increased my velocity to 30kmph east it appears to be moving north.what speed should i move north so that train appears to move exactly south east? i have tried to form two equations and have found velocity of train and velocity of train w.r.t man. but can the latter remain constant for both the cases? I have done it by using root(A^2+B^2+2ABcostheta) formula and not by vectors. The answer to the above question is 50. how do i get it?

when speed is 10kmph east, a train appears to be moving  'north-east'.when i increased my velocity to 30kmph east it appears to be moving north.what speed should i move north so that train appears to move exactly south east?
 
i have tried to form two equations and have found velocity of train and velocity of train w.r.t man.
but can the latter remain constant for both the cases?
I have done it by using root(A^2+B^2+2ABcostheta) formula and not by vectors.
The answer to the above question is 50. how do i get it?

Grade:12

1 Answers

Arun
25750 Points
3 years ago
 
Dear student
 
 
You should apply concept of reletive velocity here
Now you can find everything.
 
Hope it helps
 
Thanks and Regards

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