Three blocks A, B and C of masses 4 kg, ...

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. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is

2 N

6 N

8 N

18 N

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