v₁ = 54km/h = 15m/s v₂ = 18km/h = 5m/s Δv = 10m/s F = 100kN = 100 000N m = 1000t = 1000 000kg z drugiej zasady dynamiki F = ma => a = F/m a = 100 000N/1000 000kg = 0,1m/s² a = Δv/t => t = Δv/a t = 10m/s/0,1m/s² = 100s s = 0,5at² s = 0,5 x 0,1m/s² x (100s)² = 500m ---------------------------------------------------------------------------------------------------- Litterarum radices amarae sunt, fructus iucundiores Pozdrawiam :)
Dane: F = 100000N Δv = 36km/h10m/s m = 1000t = 1000000kg Szukane: s = ? t = ? Rozwiązanie: [latex]F=ma=frac{mv}{t}[/latex] [latex]t = frac{mv}{F}=frac{1000000kgcdot 10frac{m}{s^{2}}}{100000N}=100s[/latex] [latex]a=frac{v}{t}=frac{10frac{m}{s^{2}}}{100s}}=0,1frac{m}{s^{2}}[/latex] [latex]s=frac{1}{2}at^{2}}=frac{1}{2}cdot0,1frac{m}{s^{2}}cdot(100s)^{2}}=500m[/latex] Odp. Czas wynosi 100s, a droga 500m.
