Since the time was not specified (incomplete), and there was no equation given.
Assume the time you meant was 2s.
Using the equation;
v = u + at
At the top of the building,
u = 96ft/sec
a = -g = 32.2ft/s²
t = 2s
v = 96 + (-32)2
v = 96 - 64
V = 32m/s
Therefore the velocity at t = 2s is 32m/s.
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