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Two blocks of masses m and 3m are connec...

Two blocks of masses `m` and `3m` are connected by an inextensible string and the string passes over a fixed pulley which is massless and frictionless. `A` bullet of mass `m` moving with a velocity `'u'` hits the hanging block of mass `'m'` and gets exbedded in it. Find the height through which block `A` rises after the collision.

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