Question

The altitude of an airplane is decreasing at a rate of 45 feet per second. What is the change in altitude of the airplane over a period of 25 seconds?
A.
70 feet
B.
1,125 feet
C.
-1,125 feet
D.
-70 feet

Answer 1

To calculate the change in altitude of the airplane over a period of 25 seconds, you can use the formula:

\[
\text{Change in altitude} = \text{rate of change} \times \text{time}
\]

In this case, the rate of change is -45 feet per second (since the altitude is decreasing), and the time is 25 seconds.

Now, calculate the change in altitude:

\[
\text{Change in altitude} = -45 \, \text{feet/second} \times 25 \, \text{seconds} = -1125 \, \text{feet}
\]

So, the correct answer is:

C. -1,125 feet