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  1. A bullet comes out of the barrel of gun of length 2m with a speed of 800 m/s
  2. The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν
  3. A heavy stone hanging from a massless string of length 15 m is projected
  4. An artificial satellite is revolving round the earth in a circular orbit. Its velocity
  5. An open pipe resonates with a tuning fork of frequency 500 Hz. It is observed