To stop a car, you require first a certain reaction time to begin braking, during which the car travels at constant speed, then the car slows down under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 186 ft when its initial speed is 50 km/h, and 80 ft when its initial speed is 30 km/h. What are (a) your reaction time and (b) the magnitude of the deceleration?
To stop a car, you require first a certain reaction time to begin braking, during which the car travels at constant speed, then the car slows down under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 186 ft when its initial speed is 50 km/h, and 80 ft when its initial speed is 30 km/h. What are (a) your reaction time and (b) the magnitude of the deceleration?
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Transcribed Image Text:To stop a car, you require first a certain reaction time to begin
braking, during which the car travels at constant speed, then
the car slows down under the constant braking deceleration.
Suppose that the total distance moved by your car during these
two phases is 186 ft when its initial speed is 50 km/h, and 80 ft
when its initial speed is 30 km/h. What are (a) your reaction
time and (b) the magnitude of the deceleration?
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