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.
A weak dollar also hurts. some people and benefits others. When the value of the dollar falls. or weakens in relation to another. currency, prices of goods and ser-. vices from that country rise for. U.S. consumers.