Is there a physicist in the house?

At 22:36 10/30/2003 -0600, you wrote: IANAP (;-) but I would think that for this to be true, it would have to be an infinitely short period of time... 1) Not enough information to form an hypothesis... Is <thing> going in a straight line or circle? (I was actually thinking chain printers when I read this... ;-) 2) your statement of '30 per second' *assumes* it's at a constant speed... what if it's not? It could have started at '20 per second' and ended at '50 per second'... 3) When you said "see it at 5 and 35" if you meant to append "At The Same Time" then it would have to be at two places at once... which is a totally different problem... ;-) 4) This might actually help: Once you saw it at 35, and using the time it took to calculate that it was going "30 per hour," it's not technically at 35 anymore, so 1) isn't at that location and/or 2) could have changed speed by that time... so the next time you 'saw' it at a new location (let's say 35.5) it has either changed speed or location... Note: I'm just a stupid geek... so these answers are probably meaningless... ;-) Just my 0.000000000002 (wishing physics were required teaching in school...), Roger "Merch" Merchberger