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Question

In the figure given below, velocities of different blocks are shown. What will be the speed of block C, if pulleys are frictionless and strings are inextensible?

A
6 m/s
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B
4 m/s
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C
0 m/s
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D
None of these
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Solution

The correct option is B 4 m/s
Velocity of pulley 1,
Vp1=VA+VB2
Vp1=6+62=0
Velocity of pulley 2 will be equal to that of pulley 1 since both are connected by same string that passes over a fixed pulley.
|Vp2|=|Vp1|=0
VD=VC
Velocity of C is =4 m/s

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