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Help Please

 Dec 9, 2018
 #1
avatar+72 
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Because it is proportional to the respected numbers square. 4^2=16 and because it is proportional 80/16=5. We have to square 8 to get 64 and then multiply that value by 5 to get 320. 

 Dec 9, 2018
 #2
avatar+98102 
+1

d = kt^2

 

So

 

80 = k(4)^2

80 = 16k      divide both sides by 16

5 = k

 

So....in 8 more seconds....t = 12 and we have

 

d = 5 (12)^2

d = 5 (144)

d = 720

 

So....the didtance it falls in the next 8 seconds [ after the first 4] =  720 - 80 =  640 ft

 

 

cool cool cool

 Dec 9, 2018

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