Question

A physics student walks 100 meters in 80 seconds. The student stops for 30 seconds, and then walks 200 meters farther in 90 seconds. What is the average speed of the entire walk?

A. 0.67 m/s
B. 1.5 m/s
C. 1.8 m/s
D. 3.5 m/s

Answer 1

The average speed is found by dividing the total distance traveled by the total time taken, including stops. For this physics student, the average speed is 1.5 m/s during the entire walk.

Step-by-step explanation:

The physics student walked 100 meters in 80 seconds and then 200 meters in 90 seconds, with a 30-second stop in between. To find the average speed of the entire walk, we must take the total distance traveled and divide it by the total time taken including the stop.

Total distance = 100 m + 200 m = 300 m
Total time = 80 s + 30 s + 90 s = 200 s
Average speed = Total distance / Total time = 300 m / 200 s = 1.5 m/s.
The correct answer is B. 1.5 m/s.