# Homework Help: Velocity as a function of radial distance on an elliptical trajectory

1. Jul 1, 2009

### psid

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

Assume that a point on an ellipse is described by the vector $$r=m(a\cos{\theta},b\sin{\theta})$$, where $$0\leq m\leq 1$$ and that the vector is rotating in the clockwise direction at constant tangential velocity $$W$$ when $$m=1$$.

The problem is to find the velocity $$W(m)$$.

Also, is the angular velocity constant as it is for circular motion?

2. Jul 1, 2009

### nickjer

Did you take the time derivative of it and then calculate the magnitude of dr/dt?