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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
6 mg
B
zero
C
2 mg
D
3 mg
Detailed Solution
The block of mass 2m moves with constant velocity, so the net force on it is zero.