Physics
posted by Sarah .
I really don't get why I am getting this question wrong? Please can you explain to me how to do this question step by step so that I can understand it please? :( i have been stuck on this question for quite a while now.
Determine the stopping distances for an automobile with an initial speed of 89 km/h and human reaction time of 2.0 s for the following:
(a) an acceleration a = 4.0 m/s2.
(b) a = 8.0 m/s2.

Vo=85000m/h = 85000m/3600s = 23.61 m/s.
a. V = Vo + a*t
T = (VVo)/a + Tr
T = (023.61)/4 + 2s = 7.9 s = Stopping time.
d = Vo*t + 0.5a*t^2
d = 23.61*7.9 + 0.5*4*7.9^2 = 61.7m
b. T = (023.61)/8 + 2s = 4.95 s.
d=23.61*4.95 + 0.5*(8)*4.95^2=18.86 m. 
CORRECTION:
Vo=89,000m/1h = 89000/3600s = 24.72 m/s
a. V = Vo + va*t
T = (VV0)/a + Tr
T = (024.72)/4 + 2s.=8.18 s.=Stopping
time.
d = Vo*t + 0.5a*t^2
d=24.72*8.18 + 0.5*(40*8.18*2=68.38 m.
b. T = (024.72)/8 + 2s = 5.09 s.
d=24.72*5.09 + 0.5*(8)*5.09^2= 22.19 m.
Respond to this Question
Similar Questions

Algebra help
f(x)=x^34x^2x+4 How do I find the xintercept for this? 
Physics
I'm trying to rearange this 0 = Xo + 2^1 a t^2 for t I've been told that it is (a^1 2x)^(2^1) but I do not see how please show me step by step how you get that 0  Xo = Xo  Xo + 2^1 a t^2 (Xo = 2^1 a t^2) a^1 2 (a^1 (2Xo) … 
Mathgr12
How would I solve this equation for x in the interval 0<x<2pi tan^2x sinx  sinx/3 = 0 Please explain it step by step..ive been stuck on this question for far too long..sigh 
algebra
Solve by substitution method 3x+8y=17 2x+y=14 please show step by step so i can understand better. I keep getting it wrong at the end. 
chemistry
This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE? 
Physics
I really don't get why I am getting this question wrong? 
Physics
I really don't get why I am getting this question wrong? 
Physics
I really don't get why I am getting this question wrong? 
Math quick question
You have 500 cmÂ² of material available to cover different shapes. what is the maximum volume of each object that you could make with this amount of material? 
I'm stuck please help
Hi everyone, I've been stuck on this question. Please anyone help. Show step by step and answers. Thank you.  Determine the quarter point of y=−cos(2x−π) THANK YOU.