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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 force `F` is applied on block `m` , the masses move upward at costant speed `v` . What is the net force on the block of mass `2m` ? (`g` is the acceleration due to gravity). ltBrgt

A

2mg

B

3mg

C

6mg

D

Zero

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