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The relation between time \( t \) and distance \( x \) for a moving body is given as \( t=m x^{2}+n x \), where \( m \) and
\( \mathrm{P} \) \( n \) are constant. The retardation of the motion is:

W (When \( v \) stands for velocity)
(A) \( 2 m v^{3} \)
(B) \( 2 m m v^{3} \)
(C) \( 2 n v^{3} \)
(D) \( 2 n^{2} \mathrm{v}^{3} \)
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