Acceleration of the body after one second is twice the value of of its displacement.
after one second of travel, the displacement, velocity, acceleration, time are all related in magnitude as :
S = u t + 1/2 a t²
t = 1 u = 0
S = 1/2 a 1² => a = 2 S
V = u + a t V = a * 1 = => V = a