A snowball moving with a certain velocity in interstellar space evaporates molecules from its surface at an equal rate in all directions. The velocity of the snowball remains constant throughout the evaporation.

Question

Quizplus · Accepted Answer

The evaporation of molecules from the snowball's surface in all directions equally does not change its momentum, thus its velocity remains constant due to the conservation of momentum.

A Snowball Moving with a Certain Velocity in Interstellar Space