If 3,600 J of work is done in 3.0 s, what is the power?

Power is the rate of doing work. i. e. it is the amount of energy consumed per unit time.

Power = work/time

Now, work = 3600 J and time = 3 seconds

= 3600 J/3sec

= 1200 Watt

because 1 watt = 1J/sec

Thus, the power when 3600 J is done in 3 secs is 1200W