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  1. A ball moving with velocity 2 m/s collides head on with another stationary ball
  2. A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
  3. The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
  4. Two concentric coils each of radius equal to 2π cm are placed at right angles
  5. The phenomenon of radioactivity