A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance $$S_1$$ in the first 10 seconds and $$S_2$$ in the next 10 seconds, the relation between $$S_1$$ and $$S_2$$ is

A

$$S_2=3S_1$$

B

$$S_1=3S_2$$

C

$$S_2=2S_1$$

D

$$S_1=10S_2$$