Is a scrap heap magnet a permanent magnet

What properties of a moving object are used in determining the object's energy of motion

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.

Which branches of natural science include the study of an organism that lived 10 million years ago