To solve for the velocity $v$ and time $t$, we can use the kinematic equation for free fall motion:

h = $1/2$gt^2

Since h = 20m and g = 9.8m/s^2, we can plug in the values and solve for t:

20 = $1/2$$9.8$$t^2$ 40 = 9.8t^2
t^2 = 40 / 9.8
t ≈ √4.08

t ≈ 2.02 seconds

Now that we have calculated the time, we can find the velocity using the equation:

v = gt

v = 9.8 * 2.02
v ≈ 19.8 m/s

Therefore, the velocity $v$ is approximately 19.8 m/s and the time $t$ is approximately 2.02 seconds.