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W=mgh /:gh
m=W/gh
m=120:10m/s^2 * 0,8m=15
m=15kg
Odp. Masa tego ciała wynosi 15 kg.
F=g*m
W=g*m*s
s=80cm=0,8m
(g=(w przybliżeniu)10N/kg)
m=W/g*s=120J/10N/kg*0,8m=15kg