The dwarf planet Ceres orbits the Sun.
Ceres takes 1682 days1682\text{ days}1682 days to complete one full orbit around the Sun. The mean radius of its orbit is 414 million km414\text{ million km}414 million km.
Calculate the average orbital speed of Ceres. State your units clearly.
Comets also orbit the Sun.
Name the fundamental force responsible for keeping both Ceres and comets in orbit around the Sun.
Describe the shape of a typical comet's orbit and compare it with the orbit of Ceres.
Identify the position in its orbit where a comet travels at its maximum speed, and explain why it is fastest at this point.