(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A ferry captain wishes to travel directly across a river. A current of 4km/h is flowing and the ferry can travel at 8km/h.

a) In what direction should the captain direct the ferry?

b) What is the resultant velocity of the ferry as seen by someone standing on the riverbank?

2. Relevant equations

3. The attempt at a solution

a) The ferry should be directed to travel 26.6 degrees up stream so that it will travel in a straight line. - same as the answers.

b) I don’t get. It’s not sqrt(8^2+4^2) because it travels in a straight line now. Would it simply be 8km/h? The answers suggested 6.9m/s.

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# Ferry crossing

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