Question

Assume you live in a Einsteinian universe with the speed of light being only 60 k /hr. First you see a bicyclist at rest and later you see the same cyclist moving at 55 km/hr. Describe quantities that would change.

Answer 1

The answer is that, Mass, time, and length are the quantities that would change considering the speed of light as the limit. In Einstein's equations it depends on velocity as a fraction of the speed of light.

we can take example as,
Appeared length = rest length x (1-u²)⁽¹/²⁾
in this u is the velocity as a fraction of the speed of light.