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Can questions like the one given in the following pic be solved by taking the reference frame answhere in the middle of the string and not on the fixed pulley?(http://cnx.org/content/m14731/latest/pq8.gif)A somewhat similar method has been given in http://cnx.org/content/m14783/latest/ ( Search for Horizontal pulley system ) I'm unable to comprehend the following line: "There is an important subtle point here. ..." Why does acceleration get -ve? pl help.


Can questions like the one given in the following pic be solved by taking the reference frame answhere in the middle of the string and not on the fixed pulley?(http://cnx.org/content/m14731/latest/pq8.gif)A somewhat similar method has been given in http://cnx.org/content/m14783/latest/ ( Search for Horizontal pulley system ) I'm unable to comprehend the following line: "There is an important subtle point here. ..." Why does acceleration get -ve? pl help.


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