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Three blocks \( A, B \), and \( C \) of masses \( 3 M, 2 M \), and \( M \) are
suspended vertically with the help of springs \( P Q \) and \( T U \),
and a string \( R S \) as shown in figure. If the acceleration of
blocks \( A, B \), and \( C \) is \( a_{1}, a_{2} \), and \( a_{3} \), respectively, then
The value of acceleration \( a_{1} \) at the moment string \( R S \) is cut
is
(1) \( g \), downward
(2) \( g \), upwards
(3) More than g, downwards (4) Zero
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