Question

If a 60 kg woman, runs up a flight of stairs having a total rise of 4.0m in a time of 4.2s. What average power did she supply?

Answer 1

 PE = m * g * h 
PE = 60 * 9.8 * 4 
PE = 2352 J 

Power = E/t 

Power = PE/t 
Power = 2352/4.2 
Power = 560 Watt

Answer 2

'When a person lifts an object, work is done in the form of potential energy. The average power she supply is 560 watt.

What is power?

Power is the time rate of change of energy. It is represented by

P = E /t

Here energy is the potential energy P.E = mgh

Then average power expression is

P = mgh /t

Given is mass m of woman is 60 kg, total rise h is 4.0 m and time taken t is 4.2 s.

Substitute the values and we get the power as

P = ( 60 * 9.8 * 4 ) / 4.2s

P = 2352 J / 4.2 s

P = 560 watt

Thus, the average power she supply is 560 watt.

Learn more about power.

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