The following are the answers to the questions presented:
a. 0.000670 m^2
b. 1140.72 J
c. 0.00342 m/stroke
d. 35.1 strokes
e. 1140.72 J
I am hoping that these answers have satisfied your queries and it will be able to help you in your endeavors, and if you would like, feel free to ask another question.