Power is calculated by dividing work done by time taken. In this case, the work done is 400 Joules and the time taken is 20 seconds.
Power = Work / Time
Power = 400 J / 20 s
Power = 20 W
Therefore, the power of the machine is 20W.
None of the other options provided are correct.
If a machine does 400 Joules of work in 20 seconds, what is the power of the machine?
20W
0.05W
8,000W
none of these
1 answer