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m = 10 t= 10 000 kg
h = 10 km = 10 000 m
v = 720 km/h = 720 000m / 3600 s = 200 m/s
Szukane :
Ek = ?
Em = ?
Rozwiązanie :
Ek = 1/2mv²
Em = Ek + Ep
Ep = mgh
Ek = 1/2 * 10 000 * 200²
Ek = 200 000 000 J = 200 MJ= 0,2 GJ
Ep = 10 000 * 10 * 10 000
Ep = 1 000 000 000 = 1 GJ
Em = 0,2 GJ + 1 GJ
Em = 1,2 GJ