are in contact on a frictionless surface

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Three blocks a, b and c, of masses 4 kg , 2kg 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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Aug
Three blocks a, b and c, of masses 4 kg , 2kg 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: 2kg and 1 kg respectively are in contact [...]
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Tags: 2kg 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 , b and c`. , of masses 4 kg , then the contact force between a and b is: , Three blocks A ,