Three blocks with masses m, 2m and 3m, a...

Three blocks with masses m, 2m and 3m, are connected by strings, as shown in the figure. After an upward fforce F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

zero

2 mg

3 mg

6 mg

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