When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. And lower average kinetic energy of the molecules means they have lower speed. However, a change in average kinetic energy is not directly proportional to a change in average speed. 1.
An appreciation means an increase in the value of a currency. It means a currency is worth more in terms of foreign currency.
Yearly Average Currency Exchange Rates. Translating foreign currency into U.S. dollars. You must express the amounts you report on your U.S. tax return in U.S. dollars. Therefore, you must translate foreign currency into U.S. dollars if you receive income or pay expenses in a foreign currency.