Question

attribute controls the speed of the moving object.
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Answer 1

Explanation:

friction of the surface

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Answer 2

Answer:

The attributes of the emitter control the initial position, direction, quantity, and speed of the emitted particles. You can set the emitter options before you create the emitter, or you can create a default emitter and set the attributes after the emitter is created.

To set emitter options before creating the emitter

Select Particles > Create Emitter > or Particles > Emit from Object > .

The options window appears.

Set the options described in Set emitter attributes by typing entries.

Changes you make to the options window affect emitters you create after the changes