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9th Class Science Work and energy Question Bank 9th CBSE Science Work and energy

  • question_answer
      A girl pulls a toy with a force of 100 N through a string which makes an angle of 30° with the horizontal to move the toy by a distance of 2 m. If the string were inclined making an angle of 45° with the horizontal, then how much pull would she apply along the string to move it the same distance of 2 m?  

    Answer:

                   la Case I In Case II  Required pull,


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