Final answer:
It takes 80 watts of power to do 400 joules of work in 5 seconds, as calculated by dividing the work done by the time taken.
Step-by-step explanation:
To calculate the power required to do 400 joules of work in 5 seconds, we use the definition of power, which is simply defined as energy per time. This is how much energy is expended in how much time. The SI unit for power is watt (W), which is equivalent to 1 joule per second (1 J/s).
Using the formula Power = Work / Time, we can substitute the given values to find:
Power = 400 J / 5 s = 80 W
Therefore, it takes 80 watts of power to do 400 joules of work in 5 seconds.