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dane:
m=20t=20000kg Ek=1/2 mv^2
v=90km/h
Ek=1/2 * 20000*90^2
Ek=81000000
b)
m=80kg
v=18km/h Ek=1/2*80*18^2
Ek=12960
c)
m=600kg
v=180km/h Ek=1/2*600*180^2
Ek=9720000