Question

The average rate of elevation change in feet per second if a submarine dives 440 feet in 20

a) -2.20
b) -22
c) 22
d) 440

Answer 1

The elevation goes from 0 ft to -440 ft in 20 seconds.
Divide the feet by the seconds.

(-440 ft)/(20 sec) = -22 ft/sec

Answer 2

b)
`-22`

Explanation:

We have been given that a submarine dives 440 feet in 20 seconds. We are asked to find the average rate of elevation change in feet per second.

Since the submarine dives below the surface of water, so its elevation would be negative
`-440` feet.

To find average rate of change, we will divide total elevation by by 20.

`\text{Average rate of change}=(-440)/(20)`

`\text{Average rate of change}=(-44)/(2)`

`\text{Average rate of change}=-22`

Therefore, the average rate of elevation change is
`-22` feet per second.