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V=20m/s
g=10m/s2
Szukane:
h=?
Em=Ek+Ep
m*V2/2=m*g*h/:g
V2/2:g=h
h=(20m/s)2/2:10m/s2
h=200m2/s2:10m/s2
h=20m
Odp;Piłka spadła z wysokości 20m.
;)