Answer:
68.6 m/s
Explanation:
Recall that the velocity formula to use for accelerated motion due to gravity (g) is:
vf =vi + g * t
so if 19.6 m/s is the initial velocity for the free falling object, then, 5 seconds later under the acceleration of gravity (g) :
vf = 19.6 + 9.8 * (5) = 68.6 m/s