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September 20, 2014

September 20, 2014

Posted by **Vanessa** on Wednesday, October 8, 2008 at 10:54am.

- physics -
**bobpursley**, Wednesday, October 8, 2008 at 11:06amUpstream? the difference in velocities, downstream the sum.

Does that make sense?

vbg=vbs+vsg

where vbg is velocity of boat relative to ground; vbs is veloicty of boat relative to stream, and vsg is velocity of stream relative to ground. But note, in the case of upstream, the velocity of the stream relative to ground is negative, so one is dealing with the difference of the velocities.

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