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Em=Ek+Ep=mv²/2+mgh=20kg*(5 m/s)²/2+20kg*10m/s²*500m= 100250J
Ek= mvkwadrat/2= 10kg* (18km/h)kwadrat/2=360 j
Em= 100 000+360= 100360j
h=0.5km=500m
v=18km/h
Em=Ek+Ep
Ek=m*V/2
Ek=20*18/2=180J
Ep=m*g*h
Ep=20*10*500=100000J
Em= 180+100000=100180J=100,180kJ