Most of high-level hazardous radiation associated with nuclear energy is a result of
waste materials
mining and transportation of radioactive fuels
radiation emissions from nuclear sites
all of the above

answer is

radiation emissions from nuclear sites

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )