Answer:
25.9 feet per second.
Step-by-step explanation:
For the first 14 seconds, the change in elevation was –65×14= –910 feet.
For the remaining 6.5 minutes, the change in elevation was –1,470×6.5 = –9,555 feet.
The overall change in elevation was –910+ –9,555= –10,465 feet.
The total number of seconds was
6.5×60=14+390=404 seconds. The Average change in elevation was −10,465÷404=25.9 feet per second.
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