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F=m*g
W=m*g*s [kg*n/kg*m/s] ( po skróceniu )= [N*m/s] =[J]
W= ?
m=20t = 20000kg
g=10N/kg
v(obojętne v lub s to jest to samo) = 100m/s
W=20000*10*100
W=20000000 J =20 MJ ( mega dżuli)
odp. Praca wynosi 20 MJ