A woman runs as shown.
What main energy conversion occurs?
(1 point)
• Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.
Thermal energy changes into mechanical energy because heat provides energy
for motion.
• Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.
Mechanical energy changes into thermal energy because the energy from motion
creates heat in the air around the runner.