Three blocks with masses m, 2m and 3m ar...

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)

`3mg`

6 mg

zero

2mg

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The correct Answer is:

As all blocks are moving with constant velocity therefore ,acceleration is zero . SO net force on each block is zero.

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