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!

What is the kinetic energy of the center of mass

Tags:
  1. Nov 15, 2016 #1
    1. The problem statement, all variables and given/known data
    Two 0.50-kg carts are pushed toward each other from starting positions at either end of a 6.0-m low-friction track. Each cart is pushed with a force of 2.9 N , and that force is exerted for a distance of 1.0 m.
    What is the kinetic energy of the center of mass of the system?

    2. Relevant equations

    =1/2mvcm^2
    3. The attempt at a solution
    1/2(0.5)(2.4/6.0)
    =0.04
    i don't know how to find speed so i know this is wrong
     
  2. jcsd
  3. Nov 15, 2016 #2

    robphy

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Where is (what is the position of) the center of the mass at the beginning?
    (It might help to find the total momentum vector of the system.)
     
  4. Nov 15, 2016 #3
    i'm not sure, wouldn't it just be 3 m
     
  5. Nov 15, 2016 #4

    robphy

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Where is the center of mass (say) 0.1s later?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted