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Two identical blocks A and B each of mas...

Two identical blocks `A` and `B` each of mass `2 kg` are hanging stationary by a light inextensible flexible string, passing over a light and frictionless pulley, as shown in Fig. A shell `C` of mass `1 kg` moving vertically upwards with velocity `9 m//s` collides with block `B` and gets stuck to it.

Calculate the time after which block `B` starts moving downwards.

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