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A particle starts moving along a line from zero initial velocity and comes to rest after moving distance d. During its motion it had a constant acceleration f over 2/3 of the distance, and covered the rest of the distance with constant retardation. The time taken to cover the distance is

A

`sqrt(2d//3f)`

B

`2sqrt(d//3f)`

C

`sqrt(3d//f)`

D

`sqrt(3d//2f)`

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The correct Answer is:
C
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