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The relation between time t and distance...

The relation between time t and distance x for a moving body is given as ` t = mx^2 + nx,` where m and n are constants. The retardation of the motion is : (When v stands for velocity)

A

`2 mv^(3)`

B

`2 mnv^(3)`

C

`2n^(3)`

D

`2n^(2)v^(3)`

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