[EricH]

Velocity is a vector quantity, which means that it has both magnitude and direction. All you have is the speed, which is a scalar (and happens to be the magnitude of velocity, which is why they are often confused/used interchangeably by people who don't know/forget the difference).

So, yes, you will need some sort of direction.

Now, you can use X=a*t^2+v*t+x1, the position equation (and apply it to both X and Y), but this requires knowing starting position, the velocity component in the direction needed, and acceleration in that direction to find the position at any given time. And the velocity component requires knowing the angle...

In short, if you have both the horizontal and vertical components of velocity, or the magnitude and direction, you can solve this. Without either scenario, however, you're going to be stuck for quite some time.