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?
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.