Experiment of December 6, 2016:

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Solution video:

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What is the flight path of the tube?

A) The tube immediately takes a steep dive downwards.

B) The tube first moves horizontally and then follows a downwards parabola like a stone which has been thrown.

C) The tube actually moves slightly upwards at first and then downwards and forwards in a shallow curve.

D) The tube executes an upward parabola and then even returns to where it was launched, like a boomerang.