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m = 5t = 5000 kg
v = 540 km/h = 540 000 m / 3600 s = 150 m/s
h = 5 km = 5000 m
g ≈ 10 N/kg
Szukane :
Em = ?
Rozwiązanie :
Em = Ek + Ep
Ek = 1/2mv²
Ep = mgh
Ek = 1/2 * 5000 * 150²
Ek = 56 250 000 J = 56,25 MJ
Ep = 5000 * 10 * 5000
Ep = 250 000 000 J = 250 MJ
Em = 56,25 MJ + 250 MJ
Em = 306,25 MJ