a conservative force is a force that when work is done against this force the work done does not depend on the path taken only the initial and final position.
average speed = (distance covered) / (time to cover it)
-- traveling at 40 mph for 1 hour, the distance covered is 40 miles.
-- traveling at 60 mph for 1 hour, the distance covered is 60 miles.
-- total distance covered = (40 miles) + (60 miles) = 100 miles
-- total time = (1 hour) + (1 hour) = 2 hours
-- average speed = (100 miles) / (2 hours)
average speed = 50 miles per hour
it would be 5,400n. i hope this !