A system of two blocks A and B are conne...

A system of two blocks `A` and `B` are connected by an inextensible massless string as shown in Fig. The pulley is massless and frictionless. Initially, the system is at rest. A bullet of mass `'m'` moving with a velocity `'u'` as shown hits block If and gets embedded into it. The impulse imparted by tension force to the block of mass `3m` is

`(5mu)/4`

`(4mu)/5`

`(2mu)/5`

`(3mu)/5`

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