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  1. A body of mass 4 kg is accelerated upon by a constant force travels
  2. If fundamental frequency of closed pipe is 50 Hz then frequency of 2nd overtone
  3. If the image formed by a convex mirror of focal length 30 cm is a quarter of the size
  4. Electrons used in an electron microscope are accelerated by a voltage of 25 kV
  5. The fossil bone has a ¹⁴C:¹²C ratio, which is [1/16] of that in a living animal