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

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 2m ? (g is the acceleration due to gravity).

A

2mg

B

3mg

C

6mg

D

Zero

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