oblicz jaka sila zmniejszy predkosc samochodu z 40m/s do 10m/s w czasie 0,5min. masa samochodu 1000kg.
a=ΔV/Δt
t=0,5min=30s
a=(40m/s-10m/s)/(30s-0s)=30m/s / 30s=30m/s²
a=F/m
F=m*a
F=1000kg*1m/s²=1000N
odp potrzeba siły 1000N
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a=ΔV/Δt
t=0,5min=30s
a=(40m/s-10m/s)/(30s-0s)=30m/s / 30s=30m/s²
a=F/m
F=m*a
F=1000kg*1m/s²=1000N
odp potrzeba siły 1000N