PHY 27oA Foundations of Physics (Chase)- Spring 2017 Problem 2.36 Problem 2.36 P
ID: 2076144 • Letter: P
Question
PHY 27oA Foundations of Physics (Chase)- Spring 2017 Problem 2.36 Problem 2.36 Part A The "reaction time of the average automobile driver is Compute the total distanoecovered incoming stop aterasigrali observed from aninwalvelocity of154 l/h in school norel the peroeption of a signal to stop and the applicaton of the brakes)An automobile can slow down with an acceleration of 132 ft/s? 15.8 Incorrect: Try Again: 5 attempts remaining Part B Compute the total distance covered in coming to a stop ater a signalis observed form anintalvelooty of ST8 mai/h Submit My Answers URExplanation / Answer
here,
a)
initial speed , u = 15.4 mi/h = 6.88 m/s
accelration , a = 13.2 ft/s^2 = 4.02 m/s^2
let the distance travelled be s
v^2 - u^2 = 2* a * s
0 - 6.88^2 = 2 * 4.02 * s
s = 5.89 m = 19.32 ft
b)
initial speed , u = 57.8 mi/h = 25.83 m/s
accelration , a = 13.2 ft/s^2 = 4.02 m/s^2
let the distance travelled be s
v^2 - u^2 = 2* a * s
0 - 25.83^2 = 2 * 4.02 * s
s = 82.98 m = 272.3 ft
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