The primary advantage of a bipolar scheme is that when all the voltages are added together after a long transmission, there should be a total voltage of

There should be a total voltage of zero (0)

Explanation:

In bipolar encoding (multilevel binary), there are three voltage levels, positive, negative, and zero. The voltage level for one data element is at zero, while the voltage level for the other element alternates between positive and negative.

However, the primary advantage of a bipolar scheme is that when all the voltages are added together after a long transmission, there should be a total voltage of zero.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.