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)
Answer & explanation
Correct answer: option 2
F=mass × acceleration
the blocks are moving with constant velocity hence there will be no acceleration F = 0