The elevator shown in figure is descending with an acceleration of \( 2 \mathrm{~m} / \mathrm{s}...

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The elevator shown in figure is descending with an acceleration of \( 2 \mathrm{~m} / \mathrm{s}^{2} \). The mass of the block \( A=0.5 \mathrm{~kg} \). The force exerted by the block \( A \) on block \( B \) is
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