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m=600kg
V=4m/s
t=10s
f=0,04
Szukane:
F=?
f=a/g |*g
a=f*g
a=0,04*10m/s2
a=0,4 m/s2
a=F/m |*m
F= a*m
F=0,4 m/s2* 600kg
F= 240N
Odp.Koń działa na sanie siłą 240N