Problem
Answer the questions below. Note that a change can be an increase or a decrease. For an increase, use a positive number. For a decrease, use a negative number. (a) A tram moved upward 3 meters per second for 21 seconds. What was the total change in the tram's elevation? meters (b) In a lab, a substance was cooled by \( 48^{\circ} \mathrm{C} \) over a period of 8 hours at a constant rate. What was the change in temperature each hour? \( { }^{\circ} \mathrm{C} \)
Solution
Step 1 ：\( a = v \times t \)
Step 2 ：\( a = 3 \times 21 \)
Step 3 ：\( a = 63 \)
