# Three identical blocks of masses  m = 2 kg are drawn by a force F = 10.2 N  with an acceleration of 0.6 ms-2 on a  frictionless surface, then what is the tension (in N) in the string between the blocks B and C ? Option 1) 9.2 Option 2) 7.8 Option 3) 4 Option 4) 9.8

As we learnt in

3 block connected with string -

- wherein

Since,     Force  =  mass × acceleration

$\therefore$    F - TAB = ma  and TAB - TBC = ma

$\therefore$    TBC  =  F - 2 ma

or    TBC  =  10.2 - ( 2 x 2 x 0.6)

or    TBC  =  7.8 N

Correct option is 2.

Option 1)

9.2

This is an incorrect option.

Option 2)

7.8

This is the correct option.

Option 3)

4

This is an incorrect option.

Option 4)

9.8

This is an incorrect option.

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