The monomer of glucose makes up all carbohydrates
Potential energy decreases and kinetic energy increases.
Potential energy is related to the height, since the wagon is going downhill, height decreases and potential energy decreases.
Kinetic energy is related to the speed, since the wagon is speeding up, kinetic energy increases.
14 m/s or 50km/h. See the details in the attached picture.
The answer for this is 1200N