Nine cubes are stacked one on top of the other. If every cube has a mass of m kg, what is the direction and magnitude of:         ( a ) the force exerted on the 5th ( from the bottom ) cube by the cubes on top of it.         ( b )  the force exerted on the 5th cube by the 6th cube.         ( c )   the reaction  of the 4th cube by the 5th cube.

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