## General Question

# At what point in a planet's elliptical orbit does it move fastest? At what point does it move slowest? At what point does it 'sweep out area' at the fastest rate?

(Consider the definitions of aphelion and perihelion, and Kepler’s Laws…)

The possible answers are as follows. When you decide on one, please explain the reasoning behind your choice:

**A.** *It moves with the same speed and sweeps out the same area per unit time at all points on the orbit.*

**B.** *It moves with the same speed at all points, and sweeps out area at the fastest rate at perihelion.*

**C.** *It moves fastest at perihelion, slowest at aphelion, and sweeps out the same area per unit time at all points on the orbit.*

**D.** *It moves fastest at perihelion, slowest at aphelion, and sweeps out area at the fastest rate at perihelion.*

**E.** *It moves slowest at perihelion, fastest at aphelion, and sweeps out area at the slowest rate at perihelion.*

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