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  1. At a metro station, a girl walks up a stationary escalator in time t₁
  2. The mean radius of the earth is R, its angular speed on its own axis is ?
  3. The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
  4. The ratio of specific charge of an α-particle to that of a proton is
  5. The half-life period of a radio-active element X is same as the mean life time