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avatar+55 

Help meee

 Dec 9, 2018
 #1
avatar+94499 
+1

We have this

 

h = kv^2     so we need to find  "k"

 

And we know that

 

8 = k (20)^2

8 = k (400)    divide both sides by 400

8/400 = k  =   1/50

 

 

So....when v = 35

 

h = (1/50) (35)^2   =  24.5 m

 

 

cool cool cool

 Dec 9, 2018
 #2
avatar+72 
+1

Because h is proportional to the square of v. We have to input 20 for v and square it to get 400. 35^2=1225. We can make a proportion 8/400=x/1225. When we simplify we get 1/50=x/1225 When we cross multiply we get 50x=1225 and divide both sides by 50 we get x=24.5

 Dec 9, 2018

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