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

1. 2 mg
2. 3 mg
3. 6 mg
4. zero

Correct answer: zero

Solution

Since the blocks are moving upward at a constant speed, their acceleration is zero. This implies that the net force on each block, including the block of mass 2m, is zero.

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