+0

# Help

0
68
2

Dec 9, 2018

#1
+72
0

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
+95171
+1

$$d\; \alpha\; t^2\\ d=kt^2\\ find\;k\\ 80=k*4^2\\ k=5\\ d=5t^2\\ after\;12\;sec\\ d=5*12^2\\ d=720m\\ 720-80=640$$

So in the next 8 sec the ball will drop 640m

Dec 9, 2018