How to change object's velocity direction when button pressed

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1

Hello, I’m new to unity and I need some help. I want to change object’s constant velocity direction when one button is pressed. I know it is simple, but I can’t figure it out.33560-question.jpg

2

Depending on which axis this is a view of, something like this should work:

if(Input.GetKeyDown(KeyCode.Q)){
	yourSpeedVariable.x *= -1;
}