Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is $0.25$ .
[Assume that rod does not exerts force in vertical direction]

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F - 3 m g 4 - 6 m g 4 - T = 0 ....(i) T - m g 4 - 3 m g 4 = 0 ....(ii) From equarions (i) and (ii) ⇒ F = 13 m g 4

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