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 November 17th, 2007, 09:25 AM #1 Newbie   Joined: Nov 2007 From: UK Posts: 5 Thanks: 0 Relative Motion Question Hi guys, been givin this question for a tutorial and tis really annoying me, not sure what it states. would be brill to get some help... V=velocity Three cars travelling with constand V along a straight road. car A is travelling in same direction as B but 10 mph faster whilst C is travelling in opposite direction with speed of 100mph relative to A. What is the V of C relative to B? (90?) What is the V of B relative to C? (-90?)
 November 17th, 2007, 06:49 PM #2 Senior Member   Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3 You are correct: A is going 10 mph faster than B, so B is going 10 mph in the other direction (with respect to A). Since C is going 100 mph in the other direction (with respect to A), C is going 100 - 10 = 90 mph. I would use the positive number +90 with a qualifier of some sort in both cases; If you follow the reference frame, C with respect to B should be -90, but if you follow the statement that "C ... speed of 100 miles relative to A", than C with respect to B should be +90. Bloody physicists are always so imprecise with their use of language.
 November 18th, 2007, 12:27 AM #3 Newbie   Joined: Nov 2007 From: UK Posts: 5 Thanks: 0 Ok but the question states A is travelling in the same direction as B.

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