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A body starting from rest, accelerates a...

A body starting from rest, accelerates at a constant rate a `m/s^2` for some time, after which it decelerates at constant rate `b m/s^2` to come to rest finally. If the total time elapsed is ts the maximum velocity attained by the body is given

A

`ab/(a+b) t m/s`

B

`ab/(a-b) t m/s`

C

`2ab/(a+b) t m/s`

D

`2ab/(a-b) t m/s`

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