Three blocks with masses m , 2m and 3m 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)

1. A. Zero
2. B. 2 ,mg
3. C. 3 ,mg
4. D. 6 ,mg

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