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Three blocks A,B and C of masses 4 kg, 2 kg and 1kg 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 :

a
6N
b
8 N
c
18 N
d
2 N

detailed solution

Correct option is A

Acceleration of system = Fnet Mtotal =144+2+1=2m/s2The contact force between 4 kg and 2 kg block will move 2 kg and 1 kg block with the same acceleration soFcontact = (2+ 1) a = 3(2) = 6 N

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


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