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190 Three blocks with masses m, 2m and 3...

190 Three blocks with masses m, 2m and 3m are connected by strings, as shown in figure. After an upward force F is applied on block m, the masses move upward at constant speed u. What is the net force on the block of mass 2m (g is the acceleration due to gravity) (a) 6 mg m so Zero 2m (c) 2 mg (d) 3 mg Зm

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