Posted by J on Sunday, September 26, 2010 at 3:22pm.
I assume you are referring to a projectile on planet earth with an acceleration due to gravity of 9.8 m/s².
Neglecting air-resistance, the horizontal velocity (speed) does not affect the vertical velocity.
From the initial vertical velocity of u=10 m/s, and g=-9.8 m/s², after t=1.12 seconds, the vertical velocity, v, is given by:
v=u+gt
hint: watch out for the sign of g.
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