Modelová Otázka ID 2684 - 
Jestliže v homogenním gravitačním poli Země spadne těleso o hmotnosti 20 kg z výšky 0,5 km, jak velké množství energie se při tomto pádu uvolní?
Správná odpověď je: D
Při pádu se uvolní množství energie odpovídající úbytku potenciální polohové energie tělesa, tedy 
. Platí tak:
E = 20 kg · 500 m · 10 m · s−2 = 100 000 J = 105 J = 100 kJ.
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