When thinking about motion that's happening in two dimensions, you need to think about the two components separately.
This means, you want to divide up your acceleration, velocity, and distance values into x and y.
Do not put x & y values together in the same kinematic equation. The only value that counts for both x and y is time.
Because gravity affects vertical, a in the y direction = g = 9.8 or 9.80m/s/s
The acceleration in the x direction is zero! Notice in each of the pictures, the velocity in the x direction is constant. The overall velocity will increase and decrease, but it's the y that is changing not the x.
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