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A car , starting from rest, accelerates ...

A car , starting from rest, accelerates at the rate `f` through a distance `S` then continues at constant speed for time `t` and then decelerates at the rate `(f)/(2)` to come to rest . If the total distance traversed is `15 S` , then

A

`s=t`

B

`s=1/6ft^(2)`

C

`s=1/72ft^(2)`

D

`s=1/4ff^(2)`

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