Three blocks are initially placed as sho...

Three blocks are initially placed as shown in the figure. Block `A` has mass `m` and initial velocity `v` to the right. Block `B` with mass `m` and block `C` with mass `4m` are both initially at rest. Neglect friction. All collisions are elastic. The final velocity of blocks `A` is

`0.6 upsilon` to the left

`1.4 upsilon` to the left

`upsilon` to the left

`0.4 upsilon` to the right

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