Planet a and planet b are in circular orbits around a distant star.

planet a is 6.2 times farther from the star than is planet b.

what is the ratio of their speeds va/vb?

express your answer using three significant figures.

Explanation:

The speed that planets must have in order for their orbit to be stable, is given by:

Here v It is called orbital speed, G is the gravitational constant, M is the mass of the star and r is the radius of the orbit. In this case we have:

So, the ratio of their speed is:

at right angles to each other