a. A drone takes the following successive straight-line paths on a horizontal plane: 100 m due east, 60 m due north, 40 m due west, and finally 30 m due north. Compute the total distance travelled.
b. Determine the magnitude of the drone’s resultant displacement from its starting point.
c. Calculate, correct to one decimal place, the percentage by which the distance travelled exceeds the magnitude of the displacement.