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Applying NLM along 3 Axis

Three blocks ...

Question

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

Zero

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B

2 mg

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C

3 mg

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D

6 mg

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Solution

The correct option is A Zero
All blocks are moving with constant velocity so net force on all blocks are zero.

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