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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 4 m are both initially at rest. Neglect friction. All collisions are elastic. The final velocity of block A is

A

0.60 v to the left

B

1.4 v to the left

C

v to the left

D

0.4 v to the left

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A
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