The position -time graphs for two childen A and B returing from school O to their home P and Q respectively are who live closer to the school
who starts first from the school
who walk faster
A and B reach home at same/different time.
who ovetakes whom on the road

v = 108 m/s.

Explanation:

Given that,

The position of a particle moving on a straight line is given by :

We need to find the instantaneous velocity at  t=5s.

Velocity,

So,

Instantaneous velocity at t = 5 s will be :

v = 18+18t

v = 18+18(5)

= 18 + 90

= 108 m/s

So, the instantaneous veloctiy at  t=5s is 108 m/s.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

it may be wrong but i think its a