A crazy dog runs 300 meters east, changes his mind and then runs 200 meters west. He then changes his mind again and runs 500 meters east. This entire trip takes 2 minutes.

Complete question :

1. A crazy dog runs 300 meters east, changes his mind and then runs 200 meters west. He then changes his mind again and runs 500 meters east. This entire trip takes 2 minutes.

a) What is the total distance traveled?

b) What is the total displacement?

c) What was the dog’s average speed?

d) What was the dog’s average velocity?

1000 m ; 600 m east ; 8.333 m/s ` 5 m/s

Explanation:

Total distance :

(300 + 200 + 500) m = 1000 m

Total Displacement :

300 m east - 200 m west + 500 m east

100 m east + 500 m east

= 600 m east

Average speed :

Distance / time

100 m / 2 * 60 s

100 m / 120 s

= 8.333 m/s

Average velocity :

Displacement / time

600 m / 2 * 60 s

600 m / 120 s

= 5 m/s

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explanation: