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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 + m2     g

(c)  m1 + m2 /   m1 – m2    g

(d)  Zero

Ans . a

(24)

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