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

Three blocks with masses m, 2m, 3m. are connected by strings , as shown in the figure. After an upward forced is applied bn 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

B

2mg

C

3mg

D

6mg

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