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  1. A boy whirls a stone in a horizontal circle of radius 1.5 m and at height 2.0 m
  2. An LED is constructed from a p-n junction based on a certain semi-conducting
  3. A ray of light is incident at an angle of incidence i, on one face of a prism
  4. The number of beta particles emitted by a radioactive substance is twice the number
  5. A plumb line is suspended form a ceiling of a car moving with horizontal acceleration