The change of phase from a solid to a gas is called evaporation melting sublimation vaporization

Solid to gas stage changes are known as "sublimation." In many cases, solids transform into gases simply after an intermediate liquid state. It is an endothermic procedure (happens with the absorption of heat from the environment).  

Some example:

Freeze drying - Water can be sublimated in sustenance items by utilizing a vacuum.  

"Dry ice" or, in other words carbon dioxide and as the name proposes it experiences stage change from solid state to liquid state straightforwardly without wetting or going into liquid state.

The correct answer to the question is sublimation i.e the change of phase from solid to gas is called sublimation.

EXPLANATION:

Before answering the question, first we have to understand various changes of states of matter.

There are various state changes or phase changes in nature.

Melting: Melting is the heat phenomenon in which  substance in solid  phase is converted into liquid at its melting point. For instance, ice converted into water.

Sublimation: Sublimation is the type of phase change in which solid substance is directly converted into gas without melting. For instance, the vaporization of camphor.

Vaporization: Vaporization is the type of phase change of matter in which a liquid substance is converted into gas at its boiling point. For instance, boiling of water.

As per our question, the change is occurring from solid to gas.

Hence, the phase change will be sublimation.

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russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.