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A body starts from rest and travels a di...

A body starts from rest and travels a distance `S` with uniform acceleration, then moves uniformly a distance `2S` uniformly , and finally comes to rest after moving further `5S` under uniform retardation. The ratio of the average velocity to maximum velocity is.

A

`2/5`

B

`3/5`

C

`4/7`

D

`5/7`

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