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Net Force

Three blocks ...

Question

Three blocks with masses $m, 2 m$ and $3 m$ 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)

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 is zero

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