Answer:
Scientists have determined that humans are disrupting the nitrogen cycle by altering the amount of nitrogen that is stored in the biosphere. The chief culprit is fossil fuel combustion, which releases nitric oxides into the air that combine with other elements to form smog and acid rain.
1 Is correct because James is going faster.
2 is correct because a faster speed on a position vs time graph will have a steeper slope
3 is correct as well.
The answer is 4 all of the above
Each electron winds up with kinetic energy of
(270 keV)
plus
(whatever KE it had when it started accelerating).