| Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force 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) [NEET 2013] |
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A) Zero
B) 2 mg
C) 3 mg
D) 6 mg
Correct Answer: A
Solution :
Since all the blocks are moving with constant velocity, then the net force on the all blocks will be zero.
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