Problem F13-6 Dynamics Hibbeler 13th (Chapter 13)

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Block B rests upon a smooth surface. If the coefficients of static and kinetic friction between A and B are mu_s = 0.4 and mu_k = 0.3, respectively, determine the acceleration of each block if P = 6 lb.
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I don't understand why when calculating acceleration at B, we summed up the weight of B and the weight of A although we're studying B only. And thank you for you efforts ❤️

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