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m=10kg
Fw=F₁-F₂
F₁=50N
F₂=20N
Fw=50N-20N=30N
F=a*m
a=F/m
a=30N/10kg=3N/kg=3m/s²
S=½(at²)
t=5s
S=½(3m/s²)(5s)²=38,5m
Ad 2
m=20kg
Fwyp=F₁+F₂=50N
a=F/m=2,5m/s²
Vk=at=(2,5m/s²)(10s)=25m/s