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block1 from left has a mass of M, hanging and connected to a pulley, which is the connected to Block 2(on a table) with Mass of 2M, Block three is also hanging but with mass of 2M. If acceleration is .5m/s^2, What is the Tension on the first string?

what is the Kinetic friction of Black 2 on Table?

Fnet=Ma

I started by writing that Block 3= 2Mg-T2=2Ma

Block 2= T2-T1=2Ma

Block 1= T1-Mg=Ma

I then connected Block3 to Block2, since they share T2

I would add forces but tensions would simply cancel out, at times even masses and Tension, leaving me with known variables=known variables, makes not sense. I tried many ways. This is all the info the book gives, but I feel I'm missing a key idea.

This has been driving me insane.

The tension question was given to me on a test, which I failed answering correctly.

The Kinetic question, I know from back of book, the coefficient of kinetic friction is = .37

But I don't know how exactly how they got to it. Some one please help.