The FFA is the Future Farmers of America. It has no authority in aeronautical matters.
Speed (velocity)=distance/time
V1=98km/4hr=24.5km/hr
V2=61km/3hr=20.3km/hr
Average speed (velocity)=total velocity/ number
Average speed (velocity)=44.8km/hr/2=22.4
So the average speed is 22.4km/hr
Technically, it should roll forever.
Troposphere, stratosphere, mesosphere, thermosphere, exosphere
the answer is c because it is the 3rd step in the scientific analysis steps