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: Gravitational potential energy

  1. Nov 5, 2007 #1
    The answer is c, but I can't figure out what is the reason, can somebody kindly explain it?
    Last edited: Nov 5, 2007
  2. jcsd
  3. Nov 5, 2007 #2
    What do you think about gravitational potential energy of a cubical block?
  4. Nov 5, 2007 #3
    I am thinking about centre mass...
    So what I am figuring is
    3m*g*(3/2 l)=9/2mgl...(3/2 l because the centre of mass is at that height)
    Is it correct?
  5. Nov 5, 2007 #4
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook