Help Please

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.

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