+0  
 
-1
92
1
avatar

The quadratic function d(s)= -0.0056s^2 + 0.14s models the relationship between the stopping distance, d, in metres and speed,s, in kilometres per hour in a driving car. What is the fastest you can drive and still be able to stop within 60m?

 May 28, 2021
 #1
avatar+35059 
+2

Did you post the other incorrect version of this ????????

 

d = 60    find s

 

60 = -.0056s^2 + .-14s

-.0056s^2 + .14s - 60 = 0     Quadrtaic Formula yields    s =    still yields imaginary numbers

      if you drop the negative sign in front of the s^2  you will get   s = 91.76 km/hr      

          ( the other incorrect posting of this question had  - .0065 s^2     this one (also incorrect) has - .0056s^2    )

 May 28, 2021

30 Online Users

avatar
avatar