Explain the energy transformation that occurs when a person exercises. A. Magnetic energy transforms into mechanical energy.
B. Electrical energy transforms into mechanical energy.
C. Mechanical energy transforms into thermal energy.
D. Thermal energy transforms into electrical energy.

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.