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Two particles start simultaneously from the same point and move along two straight lines. One with uniform velocity v and other with a uniform acceleration a. if `alpha ` is the angle between the lines of motion of two particles then the least value of relative velocity will be at time given by

A

`(u cos alpha)/(f)`

B

`(u sin alpha)/(f )`

C

`( f cos alpha)/(u)`

D

`u sin alpha`

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A
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