Posted by Willie on Monday, September 21, 2009 at 7:32pm.
Use vectorial addition to add
Vb=(11.5,0) and Vm=(0,0.200)
The relative velocity of the marble with respect to the road is the sum of the vectors, add up the components to get Vr=(11.5,0.2).
The velocity is the magnitude of the resultant Vr. To determine the magnitude, see the example in:
http://www.jiskha.com/display.cgi?id=1253571803
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