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A particle starts its motion from rest u...

A particle starts its motion from rest under the of a constant force. If the distance covered in is `S_1` and that covered in first `20s isS_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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