# Vector question. care travels around a track . . .

1. Sep 6, 2008

### BeckyStar678

1. The problem statement, all variables and given/known data

a car travels around a track at a speed of 5 rev/s. the track begins with a radius of 35m and spirals such that the radius increases 5m/rev. give the speed and position of the car as functions of time. express your answers as polar vectors.

2. Relevant equations

3. The attempt at a solution

i dont get how to do it since the radius increases.

2. Sep 6, 2008

### Staff: Mentor

How about assuming constant angular momentum?

And one knows r as a function of theta, assuming the radius increases uniformly as it sweeps through one revolution (2pi or 360°).