Kinematics

[Shreyash]

Point A moves uniformly with velocity v so that vector v is continually aimed at point B, which in its turns moves rectilinearly and uniformly with velocity u

[factor-fiction]

Thanks Baldric. I've already included that with my other links

[factor-fiction]

Maybe this is the better solution, vascop.
http://www.wopho.org/problempedia-problem-detail.php?type=1&;pid=1&id=27
Good luck with it- I've got too much to do today

[Captain2]

Wow, that takes me back 40 years at a single stroke! Unfortunately the grey cells don't function at that level anymore.

[factor-fiction]

I think the OP may have forgotten he/she asked about this, so maybe it's time to get back to crosswords