I am using the following formula to draw the trajectory of a javelin (this is very basic, I am not taking into consideration the drag, etc.).
speedX = Math.Cos(InitialAngle) * InitialSpeed;
speedY = Math.Sin(InitialAngle) * InitialSpeed;
javelin.X = speedX * timeT;
javelin.Y = speedY * timeT - 0.5 * g * Math.Pow(timeT, 2);
How do I know at what angle my javelin for a given timeT?