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m=2[kg];
h=20[m];
V=2[m/s];
Vk-jakie powinno być;
Vk=pierw.2gh;
Vk=pierw.2*10*20;
Vk=pierw.400;
Vk=20[m/s];
Vx=Vk-V=20-2=18[m/s];
W=Ek=(m*Vx2)/2;
W=(2*324)/2=324[J];
Jednostka:
[W]=[kg*(m2/s2)]=[N*m]=[J].