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NEET 2013 · Connected Bodies & Pulleys

Connected Bodies & Pulleys question from NEET 2013

Q37NEET 2013Easy

Connected Bodies & Pulleys

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 upwards at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

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Answer: (c)

The blocks move at constant speed, so acceleration is zero.
Net force $= ma = 0$ for every block, including the $2m$ block.
So the answer is (c) zero.

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