22. reduction
25. Le Chatelier's principle
Explanation:
In the given situation two forces are working. These are:
1) Electric force (acting in the downward direction) = qE
2) weight (acting in the downward direction) = mg
Therefore, work done by all the forces = change in kinetic energy
Hence,
It is known that the weight of electron is far less compared to electric force. Therefore, we can neglect the weight and the above equation will be as follows.

v = 
= 592999 m/s
Since, the electron is travelling downwards it means that it looses the potential energy.
Distance, since distance represents how far something has travelled, which would be in our case 2.5m.
I believe the answer is the second one.
Explanation:
Since I can only do this by observation, the elevation of F is approximately 850km and the elevation of B is 925km.