Three blocks with masses \( m, 2 m \) and \( 3 m \) are connected by strings, as shown in figure...

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Three blocks with masses \( m, 2 m \) and \( 3 m \) are connected by strings, as shown in figure. After an upward force \( F \) is applied on block \( m \), the masses move upward at constant speed \( v \). What is the net force on the block of mass \( 2 m \) ( \( g \) is the acceleration due to gravity)
[NEET 2013]
(a) \( 6 m g \)
(b) Zero
(c) \( 2 m g \)
\( 2 m \)
(d) \( 3 \mathrm{mg} \)
\( 3 m \)
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