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#6 Help.

NotSoSmart  Feb 20, 2018
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 #1
avatar+86622 
+1

We don't need any math for the first one, NSS

 

We can never get a negative answer out of a positive root

 

Thus....all the answers that have negative x values included are no good

 

So....by process of elimination....the last answer is correct  !!!

 

 

Second one

 

We have this

 

0.75 ( 140)  = s^2  /  [ 30.25 ]      multiply both sides by  30.25

 

(30.25) ( 0.75) (140)  =  s^2

 

Take  the positive root of both sides

 

√ [ (30.25) ( 0.75) (140)  ]  =  s  ≈   56 mph 

 

 

cool cool cool

CPhill  Feb 20, 2018

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