A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/ sq. sec, then the height at which the K.E. of the body becomes half its original value is

Options :
  1. 30 m
  2. 20 m
  3. 12.5 m
  4. 10 m
Answer and Explanation :-

Answer: Option 3

Explanation:

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Il y a des époques fatales où la prière, cet hymne naturel que Dieu a mis au fond du cour de l'homme, devient suspecte aux yeux des hommes, car la prière est un acte d'espoir ou de reconnaissance.
-Alexandre Dumas The Knight of Maison-Rouge