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

  • question_answer
    A man weighing 500 N carries a load of 100 N up a flight of stairs 4 m in 5 seconds. What is the power?

    Answer:

    Given, weight of the load, \[{{W}_{L}}=mg=100\,\,N\] \[h=4mt=5sP=?\] We know, \[P=\frac{mgh}{t}\]   \[P=\frac{100\times 4}{5}=80W\]


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