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m: 10000kg Ep:? Ep+mgh
g: 10N/kg
h: 10000 km Ep= 10000*10*10000 [kg*N/kg*km]
Ep= 1000000000J
v=800km/h Ek:? Ek=m*v2/2
Ek=10000 *640000/2 [kg*km/h]
Ek= 32000J
Ep+Ek 1000000000+32000= 100032000J
Myślę że pomogłam ;)