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  1. A bomb of mass 16 kg at rest explodes into two pieces of masses of 4 kg and 12 kg.
  2. Two identical capacitors each of capacitance 5 mF are charged potentials 2 kV and 1 kV
  3. The velocity of sound is V, in air. If the density of air is increased to four times
  4. What are the unit of K = 1 / (4 π ?￢ﾂﾒ)
  5. Electrons used in an electron microscope are accelerated by a voltage of 25 kV