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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
\( \mathrm{P} \) mass \( m \) and block \( C \) with mass \( 4 m \) are both initially at rest.

W Neglect friction. All collisions are elastic. The final velocity of blocks \( A \) is
(1) \( 0.6 v \) to the left
(2) \( 1.4 v \) to the left
(3) \( v \) to the left
(4) \( 0.4 v \) to the right
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