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10:25 PM
@rob Re: Discussion of blue's Question "Is this the correct approach to find acceleration of the wedge?"
I see this question as being of the type "What is the error in my calculation?"
See blue's comment to Farcher's comment. Also blue's comment in the question, that the 1st equation might be incorrect.
Also the final question in the text : "Why is eqn 1 not applicable?" in this case.
I think the issue in blue's question is "Is eqn 1 correct? If not, what is my error?"
The accepted answer does not discuss any conceptual difficulty about applying conservation of energy to this scenario. It confirms that the equations correctly implement the conservation of energy and momentum, and points out the source of the error as a false assumption about the relation h(t) given in the problem.
 
11:14 PM
The title of the question is also conclusive for me that blue's interest is the correctness of the method he is using to find the solution to this problem, rather than a conceptual difficulty.
 
11:25 PM
RELEVANT PARTS OF THE HOMEWORK POLICY : A "homework question" is any question whose value lies in helping you understand the method by which the question can be solved... On the other hand, questions that come up in the course of doing a homework problem, but are separate from the main point of the problem, might not be considered homework questions. There's a bit of a judgment call to be made, depending on the context of the problem.
...Keep in mind that Physics Stack Exchange is not primarily a homework help site; it's a place to get specific conceptual physics questions answered. ... Ask about the specific concept that gives you trouble. We expect you to narrow down the problem to the particular concept that's giving you trouble and ask about that specifically.
It's not enough to just show your work and ask where you went wrong. If you just need someone to check your work, you can always seek out a friend, classmate, or teacher. As a rule of thumb, a good conceptual question should be useful even to someone who isn't looking at the problem you happen to be working on.
 

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