Physics question help!

[smarty_pants]

Hi, i was wondering if I could get some help on a question with physics?

the question is:

An athlete, commencing at a point due east , completes half a lap of a 440 m track in 25 s. Determine the athlete's

a) average speed

b) average velocity ( in a westerly direction)

c) average velocity if the athlete completes one full lap at the same pace

 

I get how to get a) and c) but i dont understand how they got an answer of

5.6 m s^-1 W. Please help me!

[Foodguy]

You need two things to figure out part B, the total distance the runner travels westward, and the time it takes him to get there. You are given the time, which leaves only distance traveled.

 

If you draw the track out on paper, ( assuming a circular track as no dimensions were given) and mark both the starting point and the halfway point you may notice the total distance between those two points can easily be calculated using simple geometric equations.

[swansont]

Once you work the numbers it's obvious that a circular track is assumed, even though tracks are generally not circular. Bad question in that regard, if that information wasn't explicitly given.