Trajectories (Vol 1, #9)
In the trajectories program, the setup is like the previous example, except in what is given and in what is asked for.
Instead of giving the initial speed and angle, you are given the final x position. Thus we have x as known, but we have vo and qo (which is equivalent to vxo and vyo) as unknown - NOT A FAIR TRADE! We now have four unknowns instead of three!