Three blocks with masses \( m, 2 m \) and \( 3 m \) are connected by strings, as shown in the fi... VIDEO
Three blocks with masses \( m, 2 m \) and \( 3 m \) are connected by strings, as shown in the 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).
(a) Zero
(b) \( 2 \mathrm{mg} \)
(c) \( 3 \mathrm{mg} \)
(d) \( 6 \mathrm{mg} \)
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