GAMSAT Physics Q: Can't Understand Answer? Get Help Here!

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luysion
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http://prepgenie.co.nz/gamsat/gamsat-questions/gamsat-sample-physics/
hey there's a question here if you scroll down a bit, i don't understand how the answer is C
can you please explain this to me cheers, and much appreciation to any that help.

:)
 
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You sure answer is C.. If we assume pulley is at rest.. by me it should be B, 240/7 N..

EDIT: And the pulley does seem at rest in image (it didn't download earlier!)
 

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