Question

An object is launched horizontally with a velocity of 12 m/s. What is the vertical component of velocity after 2s? What are the coordinates of the object after 4s?

Answer 1

vertical is zero.
Oh, you must mean it starts falling, not just sliding along horizontally.

Well,
velocity(vertical): -9.8t
position(vertical): -4.9t^2
position(horizontal): 12t


now just plug in your numbers for t