Answer:
Initial velocity is zero.
Explanation:
According to second equation of motion 
 

where s = distance traveled 
 t = time taken
 a = acceleration
 u = initial velocity
here in the question we have 
 s = 10 m
 t = 1 second
 a = 20

plugging the known value in order to find the unknown which is u (initial velocity)
[tex]10=u(1)+\frac{1}{2} (20)(1)^2[/tex
10 = u +10 
gives u =0 
therefore initial velocity is zero.