The planet Venus orbits the Sun.
Venus takes 225 days225\text{ days}225 days to orbit the Sun. The average radius of its orbit is 108 million km108\text{ million km}108 million km.
Calculate the average orbital speed of Venus. Give the unit.
Comets also orbit the Sun.
Name the force that causes planets and comets to orbit the Sun.
Describe the shape of a typical comet's orbit compared to the shape of Venus's orbit.
State where in its orbit a comet travels at its fastest speed, and explain why it travels fastest at this point.