(adsbygoogle = window.adsbygoogle || []).push({}); Newton's law problem....have attempted it

http://img128.imageshack.us/img128/2941/asd6rh.jpg [Broken]

rope is of negligible mass and no friction.....now this is what i did

the bc and ab are subscripts for cords between each block

9.8(10)- Tbc = 10a

9.8(40)-Tab = 40a

Tab=30a

so by substituting i get a =5.6

then i plug it in to get Tbc.....which gives me 42N.

but the answer in the book says 36.8N.....dunno what im doing wrong, any ideas?

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# Homework Help: Newton's law problem have attempted it

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