The added weight of the sand puts more downward pressure on the wheels contacting the rails, which would cause the trains speed to decrease.
I think that in order for work to be done, the object must move in the direction of the force and move over a distance.
I think the correct answer would be to electrolyze water (run an electric current through it) to decompose it into hydrogen and oxygen. Assuming 100% efficiency, it is said that it needs about 40kWh per kilogram of water to fully decompose it.
Compounds are molecules with 2 or more elements
So the answer would be the third one
CO2;H2O
Answer:
I would say A but am not sure
