The block of mass 3M is attached to the ...

The block of mass 3M is attached to the pulley system as shown in the figure. At t = 0, particle M falling vertically , strikes the block 3 M with velocity 8 m `s^(-1)` and sticks to it. The speed of the combined mass just after the collision is

`8 ms^(-1)`

`10 ms ^(-1)`

`5 ms^(-1)`

`2 ms^(-1)`

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