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23. Two masses m1 and m2 (m1 > m2) are connected by massless flexible and inextensible string passed over massless and frictionless pulley. The acceleration of centre of mass is

(a) (m₁– m₂/ m₁+ m₂) ² g

(b) m₁– m₂ / m₁+ m₂g

(c) m₁+ m_{2 /} m₁– m₂ g

(d) Zero

Ans . a

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