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Mathematical Formulation of second law

Three blocks ...

Question

Three blocks with mass m, 2m, 3m are connected by strings. After an upward force F is applied to block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m?

A

3 mg

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B

6 mg

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C

zero

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D

2 mg

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Solution

The correct option is C zero
As the block is moving with a constant velocity, the net force on it should be zero.

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