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: Reference framefrom masteringphysics

  1. Sep 20, 2005 #1
    This is the only problem taht i could not figure out for 2 hours...
    I even asked one of my friend who got 5 on his ap exam about this problem..he said no no to this question..anybody willin to help?

    .Susan, driving north at 60 mph, and Shawn, driving east at 45 mph, are approaching an intersection

    Q: What is Shawn's speed relative to Susan's reference frame?
  2. jcsd
  3. Sep 20, 2005 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Try this:
    [tex]\vec{v}_{(Shawn/Susan)} = \vec{v}_{(Shawn/Ground)} + \vec{v}_{(Ground/Susan)} = \vec{v}_{(Shawn/Ground)} - \vec{v}_{(Susan/Ground)}[/tex]

    Hint: Write the vectors in component form.
  4. Sep 20, 2005 #3
    thanks for da help
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook