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I asked this question before but could only reference it in the book, then I found the same problem online. I get why the pulley reduces the force by 2 but Why does the lever reduce the force by 2? Is that something you are just supposed to know?
http://ecareerpoint.com/questions/online/question22971.swf?Frame=1
The answer is 25N
http://ecareerpoint.com/questions/online/question22971.swf?Frame=1
The answer is 25N