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System is shown in figure and man is pulling the rope from both sides with constant speed u.Then velocity of the block will be??(a)3u/4. (b)3u/2. (c)u/4. (d)u/2

System is shown in figure and man is pulling the rope from both sides with constant speed u.Then velocity of the block will be??(a)3u/4. (b)3u/2. (c)u/4. (d)u/2

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3 Answers

Parth Yadav
26 Points
6 years ago
Velocity of pulley is the average of the velocity of the strings on each side – hint
 
 
Answer-   3u/4
…………………………………………………………………………………………………………………
Ranjeet Gupta
19 Points
6 years ago
Imagine block A and B is being pulled at the speed u insted of man pullling the string at speed u.
By Virtual Method,
\sum T.V=O
Let the velocity of mass M be V in upward direction 
applying the law
-Tu-Tu/2+2Tv=0
so,v=3u/4
Suryansh
15 Points
5 years ago
Ans is u/2 tension in the block is 3T. If you take T from the side where pulley is tied to a wall o f this wrong please explain me very carefully
 

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