8 km / (1 h + 25 min) atan2(30 cm, 1 m) -> deg let ω = 2π c / 660 nm ℏ ω -> eV fn breaking_distance(v) = v t_reaction + v² / 2 µ g0 where t_reaction = 1 s # driver reaction time and µ = 0.7 # coefficient of friction breaking_distance(50 km/h) -> m