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Two blocks placed one on top of the other are lying on a horizontal smooth surface. The coefficient of friction between the blocks is [tex]\mu[/tex].

Case 1: Horizontal force F is applied to the lower block (Fig. 14).

Case 1: Horizontal force F is applied to the lower block (Fig. 14).

[PLAIN]http://www.monbattle.com/1.jpg[/CENTER] [Broken]

Please help me to find out how they have got those equations. I'm trying to find it from past several hours but couldn't got any hint.

Please help me to find out how they have got those equations. I'm trying to find it from past several hours but couldn't got any hint.

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