A) v
B) zero
C) 2v
D) 3v
Correct Answer: B
Solution :
\[{{v}_{A}}=\frac{d}{dt}(2\,vt)=2v\] ; \[{{v}_{B}}=\frac{d}{dt}(2\,vt+2L)=2v\] |
\[\Rightarrow \] \[{{v}_{A}}={{v}_{B}}\] |
\[\therefore \] length of AB will remain same. |
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