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Homework Help: How do i calculate change in velocity?

  1. May 11, 2008 #1
    1. The problem statement, all variables and given/known data
    An airplane is flying at 2.00 x 10^2 km/h [S30.0W]. It makes a smooth wide turn and heads east at 2.00 x 10^2 km/h. Find its change in velocity.

    2. Relevant equations
    v = vf - vi

    3. The attempt at a solution

    the directions are throwing me off. What do i do after i draw it out? Can you guys tell me the answer plz? so I can make sure I did the question right

    thank you if you can help.
  2. jcsd
  3. May 11, 2008 #2


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    Science Advisor

    No, we cannot tell you the answer. I did write out suggestions as to how to do vector problems in general and then looked at the directions given here!

    Initially, the airplane was flying at 200 miles per hour due west It turned around and is flying at 200 miph due east. If you were to write "200 miles per hour due west" as +200 mph, what would "200 miles per hour in the opposite direction" be?
  4. May 11, 2008 #3
    theres is [S30.0W] and then it turns to east.... how do i calculate with this weird angle in the question?
  5. May 11, 2008 #4


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    Staff Emeritus
    Science Advisor
    Homework Helper

    [S30.0W] probably means either 30 degrees south of due west, or 30 degrees west of due south. It must have been explained by your teacher or in your textbook.

    Looks like expressing the velocity vectors in terms of components (x and y) will be useful here.
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