Three blocks 1, 2 and 3 are arranged as shown in the \( \mathrm{P} ...

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Three blocks 1, 2 and 3 are arranged as shown in the
\( \mathrm{P} \)
figure. The velocities of the blocks \( v_{1}, v_{2} \) and \( v_{3} \) are
W
shown in the figure. What is the relationship between \( v_{1}, v_{2} \) and \( v_{3} \) ?
(1) \( 2 v_{1}+v_{2}=v_{3} \)
(2) \( v_{1}+v_{2}=v_{3} \)
(3) \( v_{1}+2 v_{2}=v_{3} \)
(4) None of these
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