Question

True or false? -the speed of a planet is different at different positions in it's orbit.

Answer 1

It is true that the speed of a planet varies continuously during its orbit.

Explanation:

When in orbit a planet is moving at its fastest at perihelion and it is moving at its slowest at aphelion.

Take the Earth as an example. At perihelion, which is around 3 January, the Earth is moving at about `30.3 m` `/s^2`. At aphelion, which is around 3 July it is moving at around `29.3m` `/s^2`.

So all planets and moons travel at different speeds throughout their orbits.