Question

kiley went 5.7 km/h north and then went 5.8 km/h west. from start to finish, she went 8.1 km/h northwest. which best describes her numbers? 5.7 km/h north and 5.8 km/h west are instantaneous speeds, while 8.1 km/h northwest is the average speed. 5.7 km/h north and 5.8 km/h west are average speeds, while 8.1 km/h northwest is the instantaneous speed. 5.7 km/h north and 5.8 km/h west are average velocities, while 8.1 km/h northwest is the instantaneous velocity. 5.7 km/h north and 5.8 km/h west are instantaneous velocities, while 8.1 km/h northwest is the average velocity.

Explanation:

Speed is a scalar quantity (just magnitude), while velocity is a vector quantity (magnitude and direction). The values given with directions (north, west, northwest) are velocities. The 5.7 km/h north and 5.8 km/h west seem to describe motion over an interval (average), and 8.1 km/h northwest is the overall velocity from start - to - finish (average).

Answer:

5.7 km/h north and 5.8 km/h west are average velocities, while 8.1 km/h northwest is the average velocity.