https:// mastering physics.com Session PHY 11 Fall 2015 Homework #05 hy 111) Pro
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https:// mastering physics.com Session PHY 11 Fall 2015 Homework #05 hy 111) Problem 2.38 Problem 2.38 The "reaction time" of the average automobile driver is about 0.7 s The reaction time is the interval between the perception of a signal to stop and the application of the brakes.) An automobile can slow down with an acceleration of 11.2 ft/s Mastering Physics: Homework #05 (phy 111) Google Chrome Signed Resources previous l 7 of 9 l next Part A Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 14.2 mi n a school zone) 35 Submit My Answers Give U Incorrect, Try Again, 6 attempts remaining Part B Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 56.6 mi d2 326.90 Submit My Answers Give U Incorrect, Try Again, 9 attempts remaining Continue Provide FeedbackExplanation / Answer
use the conversion factor 1mph = 0.4470 m/s = 1.467 ft/s
so 14.2 mph = 14.2* 1.467 = 20.83 ft/s
Distance travelled d = ut = 20.83 * 0.7
D1 = 14.58 ft------<<<<<<<<<<<<<<<<<<<<<<<Answe to part A
Distance traveled with deceleration of 12 ft/s^2
after the reaction time before coming to stop,,
0 = u^2 - 2aS
S = u^2/2a
S2 = 14.58*14.58*(2 * 11.2)
= 9.49 ft---------------------<<<<<<<<<<<<<<<<<<<<<<<Answe to part B
The total distance traveled is 14.58 + 9.49
S = 14.58 + 9.49 =
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