Proper velocity by Hermann Minkowski's flat-space metric equation . Here a reference map frame of yardsticks and synchronized clocks define map position x and map time "t" respectively, and the "d" preceding a coordinate means infinitesimal change. A bit of manipulation allows one to show that proper velocity where as usual coordinate velocity . Thus finite "w" ensures that "v" is less than lightspeed "c". By grouping "γ" with v in the expression for relativistic momentum p, proper velocity also extends the Newtonian form of momentum as mass times velocity to high speeds without a need for relativistic mass. The proper velocity
N. S. Krishnan dialogues and expressed them in his drama and films so that the message came across, but the subject was not offended. He acted in nearly 150 Tamil films and the matinee-duo of N. S. Krishnan and T. A. Madhuram (later his wife) was very popular in his day; he also did roles along with leading stage and cine artists such as T. S. Durairaj, "Pulimootai" Ramasamy, C.S. Pandian and writers such as Udumalai Narayana Kavi and Subbu Armugham and gave a number of hits. He was a talented singer and his hits include "Sivakavi", "Raja Rani", and "Manamagal". Though he