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  1. A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion
  2. The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz.
  3. When we hear a sound, we can identify its source from
  4. A nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
  5. A stone of mass 1 kg tied to a light inexensible string of length L=10/3 is whirling