A​ parachutist's elevation changes by -99 ft in 9 seconds. What is the change in the​ parachutist's elevation each​ second?

The change in elevation each second can be calculated by dividing the change in elevation by the time it took to change.

Change in elevation each second = Change in elevation / Time

Change in elevation = -99 ft
Time = 9 seconds

Change in elevation each second = -99 ft / 9 seconds

Change in elevation each second = -11 ft/second.

Therefore, the parachutist's elevation changes by -11 ft each second.

To find the change in the parachutist's elevation each second, we need to divide the total elevation change by the total time taken.

The total elevation change is -99 ft and the total time taken is 9 seconds.

So, the change in the parachutist's elevation each second is calculated as:

Change in elevation per second = Total elevation change / Total time

Change in elevation per second = -99 ft / 9 seconds

Change in elevation per second = -11 ft/second

Therefore, the change in the parachutist's elevation each second is -11 ft/second.