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Question:

Which of these equals the total stopping distance?

A Perception distance + reaction distance + braking distance
Explaination

The total stopping distance is the sum of your perception distance (the distance between when you see the hazard and when your brain processes it), reaction distance (the distance between when your brain orders your foot to take action and when your foot actually begins to brake), and braking distance (how far the vehicle continues to travel once you apply the brake).