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Ep=mgh
6,9kJ= 6900J
6900J=m * 10m(na sekundę kwadrat) * 3m //:3
2300=m*10(j.w)//:10
230=m
Masa=230
W = 6,9kJ = 6900J
s=3m
g=10m/s²
Szukane:
m=?
Wzór:
W=F*s
F=m*g
W=m*g*s/ :(s*g)
m=W/s*g
m=6900J/3m*10[m/s²]
m=6900J/30[m/s²]
m=230kg