Question

Classical relativity is not applicable for

• A. two objects that move relative to a stationary observer
• B. objects moving at the speed of light
• C. two objects moving relative to each other
• D. an object moving slower than a stationary observer
• E. an object moving away from a stationary observer

Answer 1

The correct option is B objects moving at the speed of light

Classical relativity is applicable for slow moving objects, that is, speed lesser than the maximum speed achievable, $c$.

When the speed approaches the speed of light, the classical relativity fails and instead the Special Theory of Relativity comes into picture.