(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A runner covers one lap of a circular track 40.0 in diameter in 63.2 .

If she covered the first half-lap in 28.7 , what were her average velocity for that half-lap?

2. Relevant equations

We use perimeter of a cirle = 2*3.14*20m to get 125.6

3. The attempt at a solution

I know that if the runner runs around a full lap, he or she will be at 0 velocity. But at half a lap I tried 62.8/28.7 to get 2.188. Im sure that is the speed and not the answer. I know I am making a small mistake.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Velocity When a Runner Covers Half a Lap

**Physics Forums | Science Articles, Homework Help, Discussion**