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The original problem that I posted concerned a bar magnet allowed to fall
vertically through a solenoid and continue falling a short distance after
emerging from the bottom. Graph the voltage induced in the coil vs the
time of fall.
Since posting the problem, I have been hunting through my files for the
oscilloscope displays that my students photographed. No luck yet but I'm
still trying to find them.
As I remember it, the graph started from zero, showed a positive
acceleration curve until the falling magnet reached a point near the
center of the of the coil.
Then there was a sudden drop of the graph line to a negative point far
below the x axis. The last portion of the graph was an upward curve
approaching the the x axis, as the induced voltage approached zero.