Golf Ball Released from Tall Building: Velocity & Impact

[prowlerplayer]

A golf ball is released from rest from the top
of a very tall building. Choose a coordinate
system whose origin is at the starting point
of the ball, and whose y-axis points vertically
upward.
The acceleration of gravity is 9.8 m/s
2
.
Neglecting air resistance, calculate the ve-
locity of the ball after 3.99 s. Answer in units
of m/s. 029 (part 2 of 4) 10.0 points
What is its speed just before impact with the
ground? Answer in units of m/s.
030 (part 3 of 4) 10.0 points
Now assume the hot air balloon is traveling
vertically downward at a constant speed of
4.9 m/s.

 

[jambaugh]

Please submit homework in the proper format. See:
https://www.physicsforums.com/showpost.php?p=1042781&postcount=2"

Without some attempt at as solution you won't get any help here.