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System is shown in the figure and man is...


System is shown in the figure and man is pulling the rope from both sides with constant speed `u` find the speed of the block.

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`u=(0+v_1)/(2)`,`(v_1+v_2)/(2)=v`,`(-v+u)/(2)=v`
Hence`v=`velocity of `M=(3u)/(4)`
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