Q. 204.2( 5 Votes )

A man of mass 60 Kg runs up a flight of 30 steps in 40 seconds. If each step is 20 cm high, calculate the power of the man.

Answer :

Given,

Mass m= 60 kg


Number of steps = 30


Height of each step = 20 cm


Time taken= 40 s


Total height h = 20×30


= 600 cm


= 6m


Total time (t) = 40×30


= 1200 s


We know,



Work done = potential energy stored


= m × g × h


Let g = 10 ms-2


So, work done will be =60×10×6


=3600 J


Substituting value or work in above formula of power:



Power of man = 3 J/s


= 3 W


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Let's Calculate Workdone by a BodyLet's Calculate Workdone by a BodyLet's Calculate Workdone by a Body42 mins
Quiz | Lets Solve NumericalsQuiz | Lets Solve NumericalsQuiz | Lets Solve Numericals54 mins
Smart Revision | Let's Understand PowerSmart Revision | Let's Understand PowerSmart Revision | Let's Understand Power40 mins
Foundation | Let us Understand Law of Conservation of EnergyFoundation | Let us Understand Law of Conservation of EnergyFoundation | Let us Understand Law of Conservation of Energy44 mins
NCERT | Introduction to WorkNCERT | Introduction to WorkNCERT | Introduction to Work39 mins
NCERT | Energy and Its TypeNCERT | Energy and Its TypeNCERT | Energy and Its Type45 mins
Quiz | Lets Solve the NumericalsQuiz | Lets Solve the NumericalsQuiz | Lets Solve the Numericals57 mins
Rapid Fire QuizRapid Fire QuizRapid Fire Quiz53 mins
Lakhmir Singh | Work,Energy and Power (Part-1)Lakhmir Singh | Work,Energy and Power (Part-1)Lakhmir Singh | Work,Energy and Power (Part-1)40 mins
Smart Revision | Rapid Fire Round on Work, Energy and PowerSmart Revision | Rapid Fire Round on Work, Energy and PowerSmart Revision | Rapid Fire Round on Work, Energy and Power44 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses