(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

coefficient of kinetic friction = 0.15

Find the acceleration of block a.

2. Relevant equations

see below

3. The attempt at a solution

http://www.wolframalpha.com/input/?i=-200sin30%2B0.15*200cos30%2B2x%3D-200%2F32.2*a%3Bx-40%3D40%2F32.2*b%3Ba%3D0.5*b

I used x for tension and a and b for the acceleration of the blocks.

I assumed that the acceleration of block a is down the plane and so block b would go up, but the answer I got was negative! I tried assuming that block a goes up and block b goes down, but I got a negative answer again! Are the equations that I used wrong? or the blocks don't move at all?

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# Homework Help: Block on inclined plane with pulleys and friction

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