question_answer

Three identical blocks of masses \[m=2\text{ }kg\]are drawn by a force \[F=\text{ }10.2\text{ }N\] with an acceleration of \[0.6\text{ }m{{s}^{-2}}\] on a frictionless surface, then what is the tension (in N) in the string between the blocks B and C?

A) 92

B) 3.4   

C) 4 

D) 9.8

Correct Answer: B

Solution :

[b] \[F=\text{ }\left( m+m+m \right)\times a\] \[\therefore a=\frac{10.2}{6}m/{{s}^{2}}\] \[\therefore {{T}_{2}}=ma=2\times \frac{10.2}{6}=3.4\text{ }N\]