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  4. 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)

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Q. 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)Physics Question Image

NEETNEET 2013Laws of Motion

Solution:

As block of mass 2m moves with constant velocity so net force on it is zero.