Question

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 51.8 m when its initial speed is 84.5 km/h, and 19.3 m when its initial speed is 50.4 km/h. What are (a) your reaction time and (b) the magnitude of the deceleration?

Name: 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 t 95435
Uploaded: 2022-05-26T01:03:54-08:00
Duration: 3 min 25 s
Channel: Paul Gabriel
Description: 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 t 95435

          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 51.8 m when its initial speed is 84.5
km/h, and 19.3 m when its initial speed is 50.4 km/h. What are (a)
your reaction time and (b) the magnitude of the
deceleration?

Added by Sonia H.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Paul Gabriel

05/26/2022

Step 1

8 m and 19.3 m. We can set up the equations for each phase using the equations of motion. For the first phase: \(V_{f} = 0\) (final velocity is 0 when the car stops) \(S_{1} = ut + \frac{1}{2}at^2\), where \(S_{1} = 51.8\) m, \(u = 84.5 \frac{km}{h} = 23.47 Show more…

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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 51.8 m when its initial speed is 84.5 km/h, and 19.3 m when its initial speed is 50.4 km/h. What are (a) your reaction time and (b) the magnitude of the deceleration?