If a spring of stiffness $k$ is cut into two parts $A$ and $B$ of length $l_{A}: l_{B}=2: 3$, then the stiffness of spring $A$ is given by
  • A$\frac{5}{2} k$
  • B$\frac{3}{5} k$
  • C$\frac{2}{5} k$
  • D$k$
AIEEE 2011, Medium
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