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

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Three blocks with masses \( m, 2 m \) and \( 3 m \) are connected by strings, as shown in the figure. After an
\( \mathrm{P} \)
upward force \( F \) is applied on block \( m \), the masses
W
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).
(1) Zero
(2) \( 2 \mathrm{mg} \)
(3) \( 3 \mathrm{mg} \)
(4) \( 6 \mathrm{mg} \)


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