v1^2=2as
v2^2=2a(2s)
v3^2=2a(3s)
v4^2=2a(4s)
v1=[2as]^1/2
v2=[2a(2s)]^1/2
v3=[2a(3s)]^1/2
v4=[2a(4s)]^1/2
所以：
v1:v2:v3:v4:..=1:(2^1/2):(3^1/2):(4^1/2):...