Two particles having mass ratio \( n: 1 \) are interconnected by a ...

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Two particles having mass ratio \( n: 1 \) are interconnected by a light inextensible string that
P passes over a smooth pulley. If the system is released, then the acceleration of the centre of mass
W of the system is :
(1) \( (n-1)^{2} g \)
(2) \( \left(\frac{n+1}{n-1}\right)^{2} g \)
(3) \( \left(\frac{n-1}{n+1}\right)^{2} g \)
(4) \( \left(\frac{n+1}{n-1}\right) g \)
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