Which of the following quantities remain constant in a planetary motion (consider elliptical orbits)as seen from the sun?

Which of the following quantities remain constant in a planetory motion (consider elliptical orbits) as seen from the sun ?

Which of the following quantities remain constant during projectile motion?

Which of the following quantities remain constant during projectile motion?

Name the physical quantities which remain constant in a planetary motion (in elliptical orbits).

Name the physical quantites which remain constant in a planetary motion (in elliptical orbits).

Which of the following quantities remains constant during uniform circular motion ?

Which of the following quantities remains constant during uniform circular motion ?