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  1. A person can see clearly objects only when they lie between 50 cm and 400 cm from
  2. A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane
  3. A dust packet is dropped from 5th storey of a multi-storeyed building
  4. Two tuning forks are sounded together and produce 2 beats per second.
  5. The cylindrical tube of a spray pump has radius R, one end of which has n fine holes,