John is gardening and finds a tree root in the soil. He decides he will try to pull it out. He grabs onto it and uses a force of 100 Newtons. He exerts that force for 5 seconds until he is able to yank the root out, 1 meter away. How much power did John use to extract the root?
20 joules/sec
25 joules/sec please help due soon
15 joules/sec
10 joules/sec