a=3km/h^2=3000·m/(3600·s)^2 = 0.000231m/s^2 =2.31*10^(-4) m/s^2
Accelerazione $a= 3~km/h^2 = 3×\frac{1000}{3600^2}=2,3×10^{-4}~m/s^2$.
acceler. a = ΔV/Δt = 3*10^3 m / (3,6^2*10^6) = 3/(3,6^2*10^3) = 2,31*10^-4 m/sec^2
* 3 km/h^2 = (3 km)/(1 h)^2 = (3000 m)/(3600 s)^2 = (3000)/(3600)^2 m/s^2 = 1/4320 m/s^2
NB: 1/4320 = 0.00023(148) ~= 2.3/10^4