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m= 20 ton
h=5 km
V=900km/h Szukane: Ep=?
g=10m/s kwadrat Ek=?
Ep=m*g*h Ec=?
Ep=20t*10m/s*5km
Ep=1000J
Ek=m*v kwadrat/2
Ek=20t*900km/h kwadrat/2
Ek=9000J
Ec=Ek+Ep
Ec=9000J+1000J
Ec=10000J