Final answer:
To calculate the average power supplied by the secretary, use the formula Power = Work/Time. The weight of the secretary can be calculated using the formula Weight = mass x acceleration due to gravity.
Step-by-step explanation:
The average power supplied by the secretary can be calculated using the formula:
Power = Work/Time
The work done is equal to the force applied multiplied by the distance moved:
Work = force x distance
In this case, the force applied is the weight of the secretary, which can be calculated using the formula:
Weight = mass x acceleration due to gravity
The distance moved is the height of the flight of stairs.
Substitute the values into the formulas and calculate the average power supplied.