Answer:
Displacement 300m
Average speed 5.19m/s
Average velocity 2.22m/s
Explanation:
Assume X, Y and Z are all in the same line.
(1) Displacement is a distance in a defined direction. Moving 500m to Y (a defined direction) and back by 200m , actually move by 300m only in direction Y.
(2) Speed is a measure of total distance travelled in a specified period of time.
Total distance travelled is 500 + 200 = 700m
Total time spent for the whole trip is 1 min 40 sec + 35 sec = 135 sec
So the Average speed is 700/135 = 5.19 m/s
(3) Velocity is the speed in a defined direction
since Displacement = Velocity x time
where Displacement is 300m
Time = 135 sec
so Velocity = 300/135 = 2.22 m/s
