Question 1
1 pts
You eat 7,291 kJ of energy in food. You get on a bicycle machine and bike as fast as you can.
The display tells you that you did 1,780 kJ of work. Assuming your body is a closed system,
how much energy of heat did you produce (in kJ)?

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"