Power is defined as the rate at which work is done or energy is transferred. It can be calculated using the formula:
Power = Energy / Time
In this case, the energy used to load the couch into the truck is given as 500 joules, and the time taken to accomplish the task is 5 minutes.
First, we need to convert the time from minutes to seconds, as power is typically measured in watts, which are joules per second.
1 minute = 60 seconds
So, 5 minutes = 5 * 60 = 300 seconds.
Now we can calculate the power:
Power = 500 joules / 300 seconds
Power ≈ 1.67 watts
Therefore, the person used approximately 1.67 watts of power to complete the task in the given amount of time.