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)

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zero

2 mg

3 mg

6 mg

answer is A.

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Detailed Solution

All blocks are moving with constant velocity so net force on all blocks are zero

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