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A body A starts from rest with an accele...

A body `A` starts from rest with an acceleration `a_1`. After `2` seconds, another body `B` starts from rest with an acceleration `a_2`. If they travel equal distances in the `5th` second, after the start of `A`, then the ratio `a_1 : a_2` is equal to :

A

`5:9`.

B

`5:7`.

C

`9:5`.

D

`9:7`.

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