Final answer:
The power developed by the machine is 6 watts.
Step-by-step explanation:
To find the power developed by a machine, we can use the formula:
Power = Work / Time
In this case, the machine performs 24 joules of work in 4 seconds,
so the power developed by the machine is:
Power = 24 joules / 4 seconds = 6 watts
Therefore, the power developed by this machine is 6 watts.