Three blocks are stacked on top of each other on a table, theweights of each blo

Question

Three blocks are stacked on top of each other on a table, theweights of each block is shown in the image, desregarding theearths rotation, what is the net force acting on the MIDDLE block,i know the answer is 0, but could you explain the theory behindit????
and also what is the net force acting on the top block and thebottom block??? thanks !!! Three blocks are stacked on top of each other on a table, theweights of each block is shown in the image, desregarding theearths rotation, what is the net force acting on the MIDDLE block,i know the answer is 0, but could you explain the theory behindit???? and also what is the net force acting on the top block and thebottom block??? thanks !!!

Explanation / Answer

is gravity not acting on them though? 9.8 m/s^2 ???????

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