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The centre of mass of a non uniform rod of length \( L \)
\( \mathrm{P} \) whose mass per unit length \( \rho \) varies as \( \rho=\frac{k \cdot x^{2}}{L} \) where \( k \) is a

W constant and \( x \) is the distance of any point from one end, is (from the same end):
(A) \( \frac{3}{4} L \)
(B) \( \frac{1}{4} L \)
(C) \( \frac{k}{L} \)
(D) \( \frac{3 k}{L} \)
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