A 5kg book is placed on a 2.5m high shelf, how much G. P.E. has the book gained?

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

it is the most commonly accepted one

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa