1.

Where does the center of gravity lie, when a boy is doing sit-ups? Explain.

Answer»
  • The centre of gravity of a boy when he start erect, falls in the foot. 
  • When he is doing sit-ups, the centre of gravity shifts from foot to his base.
  • The weight vector also move from the base. 
  • Hence the boy stretches his hands or bends slightly towards the earth. While doing sit ups, in order to make the weight vector pass through base, so that he acquire stability.


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