Answer:
V = 19.62 [m/s]
Step-by-step explanation:
To solve this problem we must use the following equation of kinematics:

where:
V = final velocity [m/s]
Vo = initial velocity = 0
g = gravity acceleration = 9.81 [m/s²]
t = time = 2 [s]
V = 0 + (9.81*2)
V = 19.62 [m/s]