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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?

```
3 years ago

Arun
25768 Points
```							 Dear student  You should apply concept of reletive velocity here$\\\vec v_{man}=10\vec i \\\vec v_{train}=x\vec i +y \vec j \\\vec v_{train,rel}=(x-10)\vec i +y \vec j \\=>x-10=y since both component should be equal \\ to be in in north east \\\vec v_{train,rel}=(x-30)\vec i +y \vec j \\=>x-30=0 \\=>x=30 =>y=20 \\\vec v_{train}=30\vec i +20 \vec j$Now you can find everything. Hope it helps Thanks and Regards
```
7 months ago
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### Course Features

• 731 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions