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.
Foreign Currency Effects. What are 'Foreign Currency Effects'. Foreign currency effects are gains or losses on foreign investments due to changes in the relative value of assets denominated in a currency other than the principal currency with which a company normally conducts business.