2. Questions Bank
  3. 9th Class
  4. Science
  5. Work and energy

9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    A man with a box on his head is climbing up a ladder. What work is said to be done by the man on the box?

    A)  Positive             

    B)         Negative

    C)  Zero                

    D)         Undefined

    Correct Answer: A

    Solution :

     Since, the force and the displacement are in the same direction, the angle between them is\[{{0}^{o}}.\] \[W=FS\,\,\cos \theta =FS\,\,\cos {{0}^{o}}\]\[=FS\](since\[\cos {{0}^{o}}=1\]) Work done is taken as positive.


You need to login to perform this action.
You will be redirected in 3 sec spinner