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Dec 29, 2014 at 19:37 comment added Joe Wow, indeed there was an error in my proof. I can't believe it was there so long before someone noticed it. @DSinghvi - thanks for pointing it out and good catch! I corrected the error and also improved the answer a bit.
Dec 29, 2014 at 19:36 history edited Joe CC BY-SA 3.0
Fixed an error and added an example
Dec 29, 2014 at 9:53 comment added dsinghvi @Joe How are the displacement going to be same. I mean they will be governed by the ratio of their masses and the state of motion of Centre of mass. Even though if I assume masses are same wouldn't it be that the normal force are acting in the direction of moton of two bodies . One is moving backwards and other forward.
Jan 15, 2013 at 17:17 comment added Joe @Alraxite: Yes that explanation was missing from my answer, I have now added it.
Jan 15, 2013 at 17:15 history edited Joe CC BY-SA 3.0
Added a proof that the two normal forces cancel
Jan 15, 2013 at 15:27 comment added Alraxite You make a good point but you haven't explained why the work done by the block on the inlcine is exactly equal to the work done by the incline on the block. I can see that the work is negative but I can't see if it's exactly equal.
Jan 15, 2013 at 15:13 history answered Joe CC BY-SA 3.0