Average Velocity for One Person's Trip

[Balsam]

Homework Statement

A person runs 10.0m[E] in 2.0s, then 5.0m[E] in 1.5s, and finally 30.0m[W] in 5.0s. Find the person's average velocity.

Homework Equations

Vav= total displacement/total time[/B]
Total displacement=df=di

The Attempt at a Solution

[/B]
I found the total displacement to be 25m[W] and the total time to be 8.5s. Then, I used the formula to calculate average velocity, but my answer was different from the textbook's. I got 2.9m/s[W], but the answer in the book is 1.8m/s[W]. I don't know where I went wrong.

 

[berkeman]

Homework Statement

A person runs 10.0m[E] in 2.0s, then 5.0m[E] in 1.5s, and finally 30.0m[W] in 5.0s. Find the person's average velocity.

Homework Equations

Vav= total displacement/total time[/B]
Total displacement=df=di

The Attempt at a Solution

[/B]
I found the total displacement to be 25m[W] and the total time to be 8.5s. Then, I used the formula to calculate average velocity, but my answer was different from the textbook's. I got 2.9m/s[W], but the answer in the book is 1.8m/s[W]. I don't know where I went wrong.

Please show your detailed calculations so we can look for mistakes.

 

[Balsam]

Please show your detailed calculations so we can look for mistakes.

I just redrew my diagram and realized that I calculated the displacement wrong. I got the right answer now. Thanks anyways!