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m=5[kg];
h=3[m];
g=10[N/kg];
Wzór:
W=Ep=mgh;
Jednostka:
[W]=[kg*(N/kg)*m]=[N*m]=[J];
Obliczenia:
W=5*10*3=150[J].
żad.2
Dane:
h=10[m];
g=10[N/kg];
W=20000[J];
Wzór:
W=mgh;
m=W/hg;
Jednostka:
[m]=[J/(m*(N/kg)]=[kg];
Obliczenia:
m=20000/100=200[kg].
Odp.Masa jest równa m=200[kg].