how to calculate vertical velocity

[mort]

I need to calculate vertical velocity for a perjectile

[HallsofIvy]

Assuming no air resistance, acceleration vertially is -g (-9.8 m/s2 in metric, -32.2 ft/s2 in English) so that after t seconds, the velocity is -gt+ v0 (v0 is the velocity at 0 seconds).

[mort]

oops