This simulation does not include the possibility of the initial velocity being
at an angle to the horizontal. This would both increase the difficulty of the
problems, requiring the solution of a quadratic equation, and broaden somewhat
the problems to be solved.
In the questions, velocities are given to six significant figures, seemingly to
give nearly integer answers for the height of the cliff or the distance to the
bucket. Fortunately, when asking for the velocity, answers given to two or
three digits are marked as correct.
For one reviewer, problems that asked for the height of the cliff did not work.
The applet marked correct answers as incorrect, even though the answer given by
the applet in the solution is identical to that input in the answer box.