- Summary
- If particle ##A## were to be moving with speed ##v## (with reference to a fixed point) towards a particle ##B## which is moving towards ##A## with speed ##u## (with reference to the same fixed point), then why is the relative velocity of ##A## with respect to ##B## be ##v+u##?

Unable to understand why this is the case?

Also, if it were in two dimensions then I am guessing the same would apply, only the 'x-co-ordinates' and 'y-coordinates' would add up separately?

Lastly, does the same hold for acceleration.

I am aware that this is a trivial question, many books address it but I am unable to 'explain'/understand this...

Thank you!

Also, if it were in two dimensions then I am guessing the same would apply, only the 'x-co-ordinates' and 'y-coordinates' would add up separately?

Lastly, does the same hold for acceleration.

I am aware that this is a trivial question, many books address it but I am unable to 'explain'/understand this...

Thank you!