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Three blocks A, B and C of masses \( 4 \mathrm{~kg}, 2 \mathrm{~kg} \) and 1
P \( \mathrm{kg} \) respectively, are in contact on a frictionless

W surface, as shown. If a force of \( 14 \mathrm{~N} \) is applied on the \( 4 \mathrm{~kg} \) block, then the contact force between \( \mathrm{A} \) and \( \mathrm{B} \) is:
(1) \( 6 \mathrm{~N} \)
(2) \( 8 \mathrm{~N} \)
(3) \( 18 \mathrm{~N} \)
(4) \( 2 \mathrm{~N} \)
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