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The distance between two moving particle...

The distance between two moving particles at any time is `alpha`. If `v` be their relative velocity and `v_(1)` and `v_(2)` be the component of `v` along and perpendicular to `a`. The time when they are closest to each other are

A

`(a(v + v_r))/(v), a (1 + (v_r)/(u))^2`

B

`(a)/(v + v_r), a (1 + (u)/(v_r))^2`

C

`(av_r)/v , (av_r)/(u^2)`

D

`(av)/(v_r) , (au)/(v_r^2)`

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The correct Answer is:
D
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