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Two particles move in the same straight line starting at the same moment from the same point in the same direction. The first moves with constant velocity u and the second starts from rest with constant acceleration f. Then

A

they will be at the greatest distance at the end of time `(u)/(2f)` from the start

B

they will be at the greatest distance at the end of time `(u)/(f)` from the start

C

their greatest distance is `(u^(2))/(2f)`

D

their greatest distance is `(u^(2))/(f)`

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