Three blocks with masses \( \mathrm{m}, 2 \mathrm{~m} \) and \( 3 \...

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Three blocks with masses \( \mathrm{m}, 2 \mathrm{~m} \) and \( 3 \mathrm{~m} \) are connected by strings, as shown in the figure. After an
\( \mathrm{P} \) upward force \( \mathrm{F} \) is applied on block \( \mathrm{m} \), the masses moves upward at constant speed \( v \). What is the net force on the block of mass \( 2 \mathrm{~m} \) ? ( \( \mathrm{g} \) is the acceleration due to gravity)
(1) \( 6 \mathrm{mg} \)
(2) zero
(3) \( 2 \mathrm{mg} \)
(4) \( 3 \mathrm{mg} \)
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