1. Not finding help here? Sign up for a free 30min 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!

V of center of mass

  1. Oct 15, 2006 #1
    If a particle of mass 5.3 kg is moving east at 10 m/s and a particle of mass 19 kg is moving west at 10 m/s, what is the velocity of the center of mass of the pair?

    This one should be simple, here is my work:

    Vcm = (m1v1 + m2v2) / (m1 + m2)

    (-5.3kg*10m/s + 19kg * 10m/s) / -5.3 + 19

    = 10m/s

    This is wrong according to my book, why isn't this velocity of the center of mass correct ? Thanks again for all the help tonight everyone.
     
  2. jcsd
  3. Oct 15, 2006 #2

    OlderDan

    User Avatar
    Science Advisor
    Homework Helper

    A sign problem perhaps?
     
  4. Oct 15, 2006 #3
    I thought since the 5.3kg particle was moving east it would have a different sign (-). In any case, the answer is still the same with a positive sign...
     
  5. Oct 15, 2006 #4

    OlderDan

    User Avatar
    Science Advisor
    Homework Helper

    The velocity direction gives you a (-) for the velocity. The mass is always positive.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: V of center of mass
Loading...