An object moves 20 m east in 20 s and then returns to its starting point taking an additional 60 s.If west is chosen as the positive direction,what is the average speed of the object?
A) 0.5 m/s
B) -0.5 m/s
C) 8 m/s
D) 0 m/s
E) -8

Question

An object moves 20 m east in 20 s and then returns to its starting point taking an additional 60 s.If west is chosen as the positive direction,what is the average speed of the object?
A) 0.5 m/s
B) -0.5 m/s
C) 8 m/s
D) 0 m/s
E) ​-8

Quizplus · Accepted Answer

The total distance traveled by the object is 40 m (20 m east and 20 m west). The total time taken is 80 s (20 s + 60 s). Average speed is total distance divided by total time, which is 40 m / 80 s = 0.5 m/s.

An Object Moves 20 M East in 20 S and Then