Explanation:
Let's break it down step by step:
1. Total distance moved:
A to B = 5 km
B to C = 4 km (since C is 9 km and B is 5 km)
C to B = 4 km (back to B)
B to C = 4 km (again to C)
Total distance = 5 + 4 + 4 + 4 = 17 km
1. Displacement:
Since the object ends up at point C, which is 9 km from the starting point A, the displacement is:
Displacement = 9 km
1. Average speed:
Total distance = 17 km
Time = 20 minutes = 1/3 hour (convert minutes to hours)
Average speed = Total distance / Time = 17 km / (1/3) h = 51 km/h
1. Average velocity:
Displacement = 9 km
Time = 20 minutes = 1/3 hour
Average velocity = Displacement / Time = 9 km / (1/3) h = 27 km/h
Note that average velocity is different from average speed because it takes into account the direction of motion. In this case, the object ends up at a different point from where it started, so the average velocity is lower than the average speed.