An apple of mass 100 g falls from a tree. It reaches a speed of 6 m/s before landing on Isaac’s head. What is the gain of kinetic energy of the apple?

Hydrogen can be used in chemicals and as a green fuel. Vast underground stores could help make it an economical option.

Thus, it is central banks that uniquely possess the authority to modify that energy current over time, echoing the practice of ancient Roman emperors. The biggest influence on a currency’s store of ...