M= gpe / gh
G= gpe / mh
H=gpe / mg
Mars.
Water exists as small amounts of ice on Mars and as water vapor. It is suspected that Mars used to have flowing water on it, but that there is none left now.
Position 1 I believe because that is when the potential energy is released on the downfall
knowledge of first aid ... eg St John Ambulance, Red Cross etc. I think that everyone in a school should be taught First Aid.