+0  
 
+2
58
2
avatar+270 

https://vle.mathswatch.co.uk/images/questions/question16491.png

 

smileysmileysmiley

qualitystreet  Feb 13, 2018
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2+0 Answers

 #1
avatar+544 
+2

d is directly proportional to the square of t 

d=k*t^2

80=k*4^2

80=k*16

k=80/16

k=5

d=5*t^2

8+4=12

d=5*12^2

d=5*144

d=720m

 

 

winkwinkwink 

lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
 #2
avatar+270 
+1

Thanks for helping.

 

smileysmileysmiley

qualitystreet  Feb 14, 2018

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