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# Help relative velocity! watch

1. Hi! How would I go about this question using the method of expressing the original data as i-j vectors? I hate drawing vector diagrams..
2. (Original post by marinacalder)
Hi! How would I go about this question using the method of expressing the original data as i-j vectors? I hate drawing vector diagrams..
What question?
3. (Original post by Zacken)
What question?
4. (Original post by marinacalder)
That is heck of a question
5. (Original post by Zacken)
What question?
Is this method totally wrong? I keep getting 3.8km hr while the book says 4.55...
6. (Original post by marinacalder)
Is this method totally wrong? I keep getting 3.8km hr while the book says 4.55...
7. (Original post by ghostwalker)
You've been so helpful to me across posts! Thank you so much!

So is my method okay? Can I always solve a vector problem by resolving into i,j,k components?
8. (Original post by marinacalder)
You've been so helpful to me across posts! Thank you so much!

So is my method okay?
Not checked the details, but if you got the right answer, then you're almost certainly doing it via a sound method.

Can I always solve a vector problem by resolving into i,j,k components?
I would hesitate to say always. It may be true, but could lead to some nasty algebra compared with a geometric approach, particularly with closest approach problems (don't know off hand what module that's in).

I would consider it important to get to grips with the diagrams/geometry.

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