Given
d(t) = 0.8t ^2
t= 5 secs
d(5) = 0.8(5)^2 = 0.8 * 25 = 20
t= 10 secs
d(10) = 0.8(10)^2 = 0.8 * 100 = 80
20 m / 5 secs = 4 meters per sec
80 m / 10 sec = 8 meters per sec
4 mps + 8 mps = 12 mps
12 mps / 2 = 6 mps
6 mps is the average speed of the rock between 5 and 10 sec after being dropped
Answer: The last member has to finish <u><em>11 more laps</em></u> to complete <u><em>50 total laps</em></u>
Step-by-step explanation:
of 50 = 20
2nd swimmer 8
22% of 50 =<u> + 11 </u>
39 laps
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50 - 39 =<em><u> 11 laps </u></em><em> (4th and last swimmer)</em>
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<em>P.S. I think this answer is late now </em>
Because the conditions of the temperate zone is just right for organisms to thrive. not too terribly hot or cold