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S=50m
V=10m/s
f=?
S=Vot-at²/2
gdzie a=ΔV/t
S=Vot-ΔV*t/2
t=2S/(Vo-ΔV)
ΔV=5m/s
t=100/10=10s
a=ΔV/t
a=0,5m/s²
Fw=T
Fw=m*a
T=mgf
ma=mgf /:m
f=a/g=0,05 -współczynnik tarcia