A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is S 1 and that covered in the first 20 seconds is S 2 then :

1. A. S 2 = S 1
2. B. S 2 = 2S 1
3. C. S 2 = 3S 1
4. D. S 2 = 4S 1

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