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A particle starts its motion from rest under the action of a constant force. If the distance covered in first `10 s` is `s_1` and the covered in the first `20 s` is `s_2`, then.

A

`S_2=S_1`

B

`S_2=2S_1`

C

`S_2=3S_1`

D

`S_2=4S_1`

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