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A car, starting from rest, accelerates a...

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 travelled is 15 s, then

A

`s=ft`.

B

`s=frac(1)(6)ft^2`.

C

`s=frac(1)(2)ft^2`.

D

`s=frac(1)(4)ft^2`.

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