Three blocks \( A, B \) and \( C \), of masses \( 4 \mathrm{~kg}, 2 \mathrm{~kg} \) and \( 1 \ma....

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Three blocks \( A, B \) and \( C \), of masses \( 4 \mathrm{~kg}, 2 \mathrm{~kg} \) and \( 1 \mathrm{~kg} \) respectively, are in contact on a frictionless
\( \mathrm{P} \)
surface, as shown. If a force of \( 14 \mathrm{~N} \) is applied on the \( 4 \mathrm{~kg} \) block, then the contact force between \( A \) and \( B \) is
(1) \( 8 \mathrm{~N} \)
(2) \( 18 \mathrm{~N} \)
(3) \( 2 \mathrm{~N} \)
(4) \( 6 \mathrm{~N} \)


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