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  4. Block A of mass 2m is hanging from a vertical massless spring of spring constant k and is at rest. Another block B of mass m strikes the block A with velocity u and sticks to it as shown. The magnitude of the acceleration of the combined system of blocks just after collision is: <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-pwcwstjajt31xrlt.jpg />

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Q. Block $A$ of mass $2m$ is hanging from a vertical massless spring of spring constant $k$ and is at rest. Another block $B$ of mass $m$ strikes the block $A$ with velocity $u$ and sticks to it as shown. The magnitude of the acceleration of the combined system of blocks just after collision is :
Question

NTA AbhyasNTA Abhyas 2022

Solution:

$a=\frac{3 m g - 2 m g}{3 m}=\frac{g}{3}$