Three blocks with masses m, 2 m and 3 m are connected by strings as shown...

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Three blocks with masses m, 2 m and 3 m 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) F (a) 2 mg (c) 6 mg 2m 3m (b) 3 mg (d) zero Three blocks with masses m, 2 m and 3 m 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) F (a) 2 mg (c) 6 mg 2m 3m (b) 3 mg (d) zero

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