# Answer to Question #51376 in Mechanics | Relativity for ji min lee

Question #51376

To stop a car, first you require a certain reaction time to begin braking; then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 51.9 m when its initial speed is 78.3 km/h, and 23.6 m when its initial speed is 49.1 km/h. What are (a) your reaction time and (b) the magnitude of the deceleration?

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