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  1. The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
  2. A ball is dropped from the root of a tower of height h
  3. When a light beam of frequency v is incident on a metal surface,
  4. Two spheres of mass m and M are situated in air and the gravitational force
  5. The wavelength of the first line of Lymasn series for hydrogen atom is equal