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

9th Class Science Work and energy Question Bank Work Power and Energy Formative Subjective Problems

  • question_answer
    If 784 J of work was done in lifting 20kg mass, then calculate the height through which it was lifted. (Take \[\text{g}=\text{9}.\text{8 m}{{\text{s}}^{-\text{2}}}\])

    Answer:

    \[W=784\,J\] \[m=20\,kg\] \[g=9.8\,\,m/{{s}^{2}}\] \[h=?\] \[W=mgh\] \[h=\frac{784}{20\times 9.8}=4\,m\]


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