- #1
phlstr
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Homework Statement
coefficient of kinetic friction = 0.15
Find the acceleration of block a.
Homework Equations
see below
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?