v = -19.6 m / s, y =y₀ + v₀ t - ½ g t²
Explanation:
This is an exercise in kinetics in one dimension, let's take the upward direction as positive
v = v₀ - g t
in this case as the body is released its initial velocity is zero and the acceleration is -g the sign indicates that it is directed downwards
v = 0 -g t
v = - 9.8 2
v = -19.6 m / s
the sign indicates that the speed is down.
Galileo's equation is
y =y₀ + v₀ t - ½ g t²
where i is the initial height, v₀ the initial velocity and -g the acceleration of the body