Physics · GRAVITATION
हिन्दीA planet moves in an elliptical orbit around the Sun. If the speed of the planet at perihelion (distance \( r_P \)) is \( v_P \), what is its speed \( v_A \) at aphelion (distance \( r_A \))?
Correct answer · Option 1
\( v_P (\frac{r_P}{r_A}) \)
Explanation
By conservation of angular momentum about the Sun, m r_P v_P = m r_A v_A, giving v_A = v_P (r_P / r_A).