Answer :
The lifeguard used 10 watts of power to lift the chair.
What is power?
Power is the ability to influence and control others or to influence the outcome of events. It is the capacity to make decisions and carry out actions that result in a desired outcome. Power is often seen as an advantage and can be used to bring about positive change. Power can also be abused and used in a negative way.
This was calculated by-
50 joules of work / 5 seconds = 10 watts.
This power is the rate at which the lifeguard was able to do work. It is the amount of energy that the lifeguard was able to transfer in order to move the chair from one side of the pool to the other.
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