A delivery van starts from town P and travels successively along straight roads as follows:
• P to Q: 24km due east in 30min
• Q to R: 18km due north in 20min
• R to S: 12km due west in 15min
Assume the directions are exactly along the cardinal points.
a. (a) Compute the total distance travelled and the total time taken.
b. (b) Determine the magnitude of the resultant displacement from P to S.
c. (c) Calculate the average speed for the entire journey.
d. (d) Calculate the magnitude and compass direction of the average velocity for the entire journey.