Final answer:
Safe speed depends on reaction time and stopping distance, which increase with speed. Maintaining a safe speed is crucial for efficient braking.
Explanation:
Safe speed is determined by the ability to respond quickly in emergencies and stop within a reasonable distance. Stopping distance increases with speed due to the time needed to react and slow down the car. At higher speeds, the increase in stopping distance is more rapid, emphasizing the importance of maintaining a safe speed for effective braking.
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