Three blocks with masses `m` , `2m` and `3m` are connected by strings, as shown in the figure. After an upward force `F` is appl

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. Zero
B. 2 mg
C. 3 mg
D. 6 mg

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

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