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Fn=300 000N
Ft (tarcie) = 5/1000* Q
Q=mg
g=10N/kg
Q=1000 000kg*10N/kg
Q=10 000 000 N
Ft=5/1000* 10 000 000 N
Ft=50 000N
Fw=Fn-Ft=300 000N-50 000N
Fw=250 000N
Fw=ma
a=Fw/m
a=250 000N/1000 000kg
a=1/4 m/s²
S=1km=1000m
S=at²/2→→S=a(v/a)²/2 →→S=v²/2a
a=v/t
t=v/a
S=v²/2a
v²=2Sa
v=√2Sa
v=√2*1000 m*1/4 m/s²
v=√500 [m/s]
v≈22,35 m/s
t=v/a
t=22,35 m/s:1/4 m/s²
t=89,44 m