Auniform wire is cut into 4 segments. each segment is twice as long as the earlier segment. if the shortest segment has a resistance of 4 ohm, find the resistance of original wire.

The resistance of a piece of wire is directly proportional to its length, so we know that just like the length, the resistance of each segment is also twice the resistance
of the previous ('earlier') segment.

So the resistances of the segments are:

4
8
16
32

and their total resistance before they were cut up was

(4 + 8 + 16 + 32) = 60 ohms

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.