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In the figure shown all the contacts are smooth. Strings and spring are light. Initially \( \mathrm{A} \) is held by someone and \( \mathrm{B} \) and \( \mathrm{C} \) are at rest. Masses of \( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are \( \mathrm{M}, \mathrm{M} \) and \( 2 \mathrm{M} \) respectively. Then just after the block \( \mathrm{A} \) is released which of the following statements are correct :-
(I) Acceleraion of block \( \mathrm{A} \) is \( \frac{\mathrm{g}}{2} \)
(II) Acceleration of block B is zero
(III) Acceleration of block \( \mathrm{C} \) is zero
(IV) Acceleration of block \( \mathrm{B} \) is \( \frac{\mathrm{g}}{2} \)
- (I) I \& IV
(2) I, II \& IV
(3) I, III \& IV
(4) All are correct
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