Posted by **Calculus** on Friday, October 1, 2010 at 1:45pm.

A runner sprints around a circular track of radius 150 m at a constant speed of 7 m/s. The runner's friend is standing at a distance 300 m from the center of the track. How fast is the distance between the friends changing when the distance between them is 300 m? (Round to 2 decimal places.)

I get how to do related rates. But I have no idea where to start with this question. I know we have to use the formula c^2= a^2 + b^2 - 2(ab)cosC but thats it

## Answer this Question

## Related Questions

- Calculus - A runner sprints around a circular track of radius 150 m at a ...
- College Calculus 1 - A runner sprints around a circular track of radius 150 m at...
- physics - A runner is moving at a constant speed of 8.00 m/s around a circular ...
- physics - A runner circles a track of radius 50 m in 50 s moving at a constant ...
- physics - A runner covers one lap of a circular track 40.0 m in diameter in 62.5...
- physics - Suppose runner A starts at the 0 degree mark on a circular track (...
- science - A jogger jogs around a circular track with a diameter of 330 meters in...
- Science - Please Check my Answer 2 - My problem: One runner in a relay race has ...
- physics - 1.Moving with uniform acceleration a body covers 150m during 10sec so ...
- Physics - A runner is jogging at a steady 8.4 km/hr. When the runner is 2.6 km ...