The pronghorn antelope, found in North America, is the best long distance runner
among mammals. It has been observed to travel at an average speed of more than 55
km/h over a distance of 6.0 km. Suppose the antelope runs a distance of 5.0 km in a
direction 11.5° north of east, turns, and then runs 1.0 km south. Calculate the resultant
displacement.