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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

A

`0.6` v to the left

B

`0.4` v to the left

C

v to the left

D

`0.4` v to the right

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