Posted by J on Sunday, September 26, 2010 at 3:22pm.
a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?

College Physics  MathMate, Sunday, September 26, 2010 at 3:33pm
I assume you are referring to a projectile on planet earth with an acceleration due to gravity of 9.8 m/s².
Neglecting airresistance, 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.