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  1. A ball is thrown vertically downwards from a height of 20 m with an initially
  2. The moon’s radius is 1/ 4 that of the earth and its mass is 1 / 80 times that of the earth
  3. At what height h above earth, the value of g becomes g/2 (where R=radius of earth)?
  4. What is the difference between soft and hard X-ray?
  5. Three fourth of the active material decays in a radioactive sample in 3/4 sec