Question

1) What is this relationship?
2) Explain sole astronomical units of measurement.

Answer 1

1) m = m° ÷ √( 1 - v²/ c² ) is equation of relativistic mass .

m° is the rest mass of an object.

m is the relativistic mass.
When object moves with velocity v its mass m won't be absolute.
mass is relative to velocity ( kinetic energy). It's not only relative to kinetic energy.
m = E ÷ c²
mass is relative to energy. As energy increases mass also increases.
And any object that has mass can't approach the speed of light.

2) Astronomical unit (AU) is the mean distance between sun and earth.
1 AU = 150 million km