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Three blocks A, B and C of m asses 4kg, ...

Three blocks A, B and C of m asses 4kg, 2kg and lkg respectively are in con tact on a frictionless surface, as show n. If a force of 14 N is applied o n th e 4kg b lo ck , th e n th e c o n ta c t fo rce betw een A and B is

A

2n

B

6n

C

8n

D

18n

Text Solution

Verified by Experts

The correct Answer is:
B
Acceleration of system `=(f_(net))/( M_(total )) `
`= (14)/(4+2+1) = 2 m//s^(2)`

the contact force between 4 kg & 2kg block will move 2kg & 1kg block with same acceleration
so `F_(contact ) = (2+ 1 ) a= 3 (2) = 6N`
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