Two blocks A \& B with mass 4 kg and 6 kg respectively are connected by a stretched spring of negligible mass as in figure. When the two blocks are released simultaneously the initial acceleartion of B is $1.5 m / s^{2}$ westward . The acceleration of A is

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​ T = M B ​ × a B ​ but T is also equal to M A ​ a A ​ ​ M B ​ a B ​ = M A ​ a A ​ ⇒ 6 × 1.5 = 4 × a A ​ ⇒ a A ​ = 2.25 m / s 2 ] ​

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