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Posted by on Wednesday, October 17, 2012 at 3:13pm.

A boat’s speed in still water is 1.95m/s . The boat is to travel directly across a river whose current has speed 1.20m/s .
Determine the speed of the boat with respect to the shore.

Despite, I did it like taking the sqrt (1.95^2+1.20^2)

is there something wrong I did?

Thank you for your care.

  • Physics - , Wednesday, October 17, 2012 at 3:22pm

    respect to the shore?

    The boat has to head upstream, and that velocity is countered by the stream:

    v=sqrt(1.95^2-1.2^2)

    So the slant angle reduces the speed across.

  • Physics - , Wednesday, October 17, 2012 at 3:26pm

    Oh yes, u r right, didn' t care it, ty so much

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