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  4. In the arrangement shown, the pulleys and the strings are ideal. The acceleration of block B is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/399c2053d5642b94526704258f79c46e-.png />

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Q. In the arrangement shown, the pulleys and the strings are ideal. The acceleration of block $B$ is
image

Laws of Motion

Solution:

image
For $B : mg -T = ma$
For $A:2T -mg =\frac{ma}{2}$
$\Rightarrow mg=\frac{5}{2}ma$
$a=\frac{2g}{5}$