Three blocks A, B and C of masses 4  kg, 2  kg and 1  kg respectively, are in contact on a fricti...

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Three blocks A, B and C of masses 4  kg, 2  kg and 1  kg respectively, are in contact on a frictionless surface, as shown in the figure. If a force of 14  N is applied on the 4  kg block, then the contact force between A and B is
(a) 2  N
(b) 6  N
(c) 8  N
(d) 18  N

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