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

A car,starting from rest, accelerates at the rate f through a distance s, then continuous at constant speed for time t and then decelerates at the rate `f/2` come to rest. If the total distance traversed is 5 s,then :

A

`s=1/4 ft^2`

B

`s=1/2 ft^2`

C

`s=1/6 ft^2`

D

`s=ft`

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