Answer: 0.914 km/hour or 914 meters/hour
Step-by-step explanation:
To calculate Joanne's speed, we need to divide the distance she traveled by the time it took her to travel that distance. In this case, she walked a total distance of 0.4 km south + 0.5 km north + 0.7 km = 1.6 km. To find her speed, we divide the distance traveled by the time it took:
Speed = 1.6 km / 1.75 hours
= 0.914 km/hour or 914 meters/hour
Velocity, on the other hand, is a vector quantity that describes an object's speed and direction. In this case, Joanne walked 0.4 km south and then 0.5 km north and then 0.7km to forever 21 so her direction is not constant. Therefore, her velocity would be zero, because her displacement is zero.