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F=W/s
F=120/0,8 = 1200/8 = 150 N
F= a * m
a=g
m= F/a
m= 150/10 = 15 kg
F=W/s
W=120J
s=80cm = 0,8m
F=120J/0,8m=150N
F=m*a
m=F/a
a=10m/s²
m=150N:10m/s²=15kg