Ta có:
\(R'=Rcos60^0=6400\cdot cos60^0=3200\left(km\right)=3200000\left(m\right)\)
Tốc độ góc: \(\omega=\dfrac{2\pi}{T}=\dfrac{2\pi}{24\cdot60\cdot60}\approx7,3\cdot10^{-5}\left(\dfrac{m}{s}\right)\)
Tốc độ của A: \(v=\omega R'=7,3\cdot10^{-5}\cdot3200000\approx232,7\left(\dfrac{m}{s}\right)\)