Well, assuming the gravity still has a value, named "g" (although the building is infinitely tall and then its value should be zero), the velocity should be,
v=-gt
take t=2, and you have,
v=-2g
If you assume g=9.8 m/s^2, then,
v=-19.6 m/s.
But remember that physically there is no infinitely tall building.
A stone is dropped from rest from an infinitely tall building. Compute its velocity after 2 seconds
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