1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Relative velocity of a boat

  1. May 12, 2008 #1


    User Avatar

    1. The problem statement, all variables and given/known data

    2. A boat heads 15° west of north witha water speed of 3m/s. Determine its velocity relative to the ground when there is a 2m/s current from 40° east of north.

    2. Relevant equations

    cosine law

    3. The attempt at a solution

    I found the angle between the two vectors to be 125 and then used cosine law and gor the resultant velicity as 4.459 km/ h but the ans. is 2.5 m/h
  2. jcsd
  3. May 12, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi a.a! :smile:

    2.5 is the right answer if the current is the other way round. :confused:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook