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Why is the answer to gravitational potential energy question C?

Thread starter jack1234
Start date Nov 5, 2007
Tags

Energy Gravitational Gravitational potential Gravitational potential energy Potential Potential energy

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3 replies · 3K views

jack1234

Thread starter
Nov 5, 2007

#1

The answer is c, but I can't figure out what is the reason, can somebody kindly explain it?
http://tinyurl.com/32322t

Last edited: Nov 5, 2007

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Sourabh N

Nov 5, 2007

#2

What do you think about gravitational potential energy of a cubical block?

jack1234

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?

Sourabh N

Nov 5, 2007

#4

perfect.

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