Question Number 88961 by Zainal Arifin last updated on 14/Apr/20
$$\mathrm{One}\:\mathrm{care}\:\mathrm{travels}\:\mathrm{due}\:\mathrm{east}\:\mathrm{at}\:\mathrm{40}\:\mathrm{km}/\mathrm{h}. \\ $$$$\mathrm{and}\:\mathrm{second}\:\mathrm{car}\:\mathrm{travels}\:\mathrm{north}\:\mathrm{at}\: \\ $$$$\mathrm{40}\:\mathrm{km}/\mathrm{h}.\:\mathrm{are}\:\mathrm{their}\:\mathrm{velocities}\:\mathrm{equal}? \\ $$
Commented by ajfour last updated on 14/Apr/20
$${No},\:{since}\:{directions}\:{are}\:{not}\:{same}. \\ $$
Commented by MJS last updated on 14/Apr/20
$$\mathrm{watch}\:\mathrm{the}\:\mathrm{tachometer}\:\mathrm{of}\:\mathrm{any}\:\mathrm{car}.\:\mathrm{does}\:\mathrm{it} \\ $$$$\mathrm{show}\:\mathrm{different}\:\mathrm{values}\:\mathrm{if}\:\mathrm{the}\:\mathrm{car}\:\mathrm{travels}\:\mathrm{40km}/\mathrm{h} \\ $$$$\mathrm{east}\:\mathrm{first}\:\mathrm{and}\:\mathrm{then}\:\mathrm{40km}/\mathrm{h}\:\mathrm{north}?\:\mathrm{what}\:\mathrm{do} \\ $$$$\mathrm{you}\:\mathrm{expect}\:\mathrm{and}\:\mathrm{what}\:\mathrm{do}\:\mathrm{you}\:\mathrm{observe}? \\ $$
Commented by Zainal Arifin last updated on 01/May/20
$$ \\ $$$$\mathrm{yes}.\:\mathrm{you}\:\mathrm{are}\:\mathrm{right},\:\mathrm{the}\:\mathrm{velocity}\:\:\mathrm{depend}\:\mathrm{with}\:\mathrm{directions}. \\ $$$$ \\ $$