There are a few more elements which you might consider. Like, when dropping a hammer along with a feather in earth, the feather descends slower than the hammer. Reason: although the force of gravity is same, their mass, and the resistance from external forces faced by them is an entirely different story. The air between the object and the ground must also be taken into consideration. Whereas, moon lacks atmosphere and hence they fall at relatively same speed (with only low gravity acting upon them).
As in http://en.wikipedia.org/wiki/Comet_tail
As a comet approaches the inner Solar System, solar radiation causes
the volatile materials within the comet to vaporize and stream out of
the nucleus, carrying dust away with them. The streams of dust and gas
thus released form a huge, extremely tenuous atmosphere around the
comet called the coma, and the force exerted on the coma by the Sun's
radiation pressure and solar wind cause an enormous tail to form,
which points away from the Sun.
Similar to the air acting on the detached feather (as said above), the solar radiation pressure and solar winds act on the tail debris of the comet. For instance, you drop an article from a moving vehicle, it falls to the ground rather than flying in the air at the same speed. Deceleration and opposite forces like solar winds cause it to slow down.
UPDATE: The reason why mass is taken into consideration is due to the fact that mass is directly proportional to gravity. So, increasing the mass means increased gravitational pull. That is why heavier objects like hammer fall faster than lighter objects like feather. Explaining this would be a matter of physics and not astronomy which is irrelevant to this website and should be discussed in the physics website.
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