(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The "reaction time" of the average automobile driver is about 0.700 . (The reaction time is the interval between the perception of a signal to stop and the application of the brakes.) If an automobile can slow down with an acceleration of 12.0 , compute the total distance covered in coming to a stop after a signal is observed (a) from an initial velocity of 15.0 (in a school zone) and (b) from an initial velocity of 55.0 .

x=?

xo=?

vx=0, point at which you are stopped

vxo=15 mi/h initial speed

ax=-12 ft/s^2

t=?

2. Relevant equations

v=d/t

vx^2=vxo^2+2ax(x-xo)

3. The attempt at a solution

I am pretty much lost, I tried converting everything to meters as that is what the answers call for, and got the equation

vx^2-vxo/2ax= (0)^2 -(6.7056)^2/ 2(-3.6576)= 6.1468 meters

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# Homework Help: Driver reaction time, with negative acceleration

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