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A \( 2 \mathrm{~kg} \) block is placed over a \( 4 \mathrm{~kg} \) block and both are placed on a smooth horizontal surface. The coefficient of
P friction between the blocks is \( 0 \cdot 20 \). Find the acceleration of the two blocks if a horizontal force of \( 12 \mathrm{~N} \) is applied
W to (a) the upper block, (b) the lower block. Take \( g=10 \mathrm{~m} / \mathrm{s}^{2} \).
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