NCERT Exercise 1.15 - Units and Measurements
Question: A famous relation in physics relates 'relativistically moving mass' m to the 'rest mass' m₀ of a particle in terms of its speed v and the speed of light c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes: m = m₀ / (1 - v²)¹/². Guess where to put the missing c.
Answer: The correct formula is **m = m₀ / √(1 - v²/c²)**.
Full step-by-step NCERT solution with diagrams on Something by Zero.