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An arrangement of two blocks of same mass m kept inside a lift which is moving with
\( \mathrm{P} \) acceleration a in vertical downward direction. Find

W acceleration of block A with respect to ground :-
(1) \( \frac{1}{2} \sqrt{5 \mathrm{a}^{2}+2 \mathrm{ga}+\mathrm{g}^{2}} \)
(2) \( \frac{1}{2} \sqrt{5 a^{2}-2 g a+g^{2}} \)
(3) \( \frac{1}{2} \sqrt{5 \mathrm{a}^{2}-2 \mathrm{ga}-\mathrm{g}^{2}} \)
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