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A submarine descends from sea level to the entrance of an underwater cave. The elevation of the entrance is -120 feet. The rate of change in the submarine's elevation is no greater than -12 feet per second. Can the submarine reach the entrance to the cave in less than 10 seconds? Write an inequality. Explain.

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Respuesta :

TheSMan
No
t > or = 120/12
As the max rate of descent is 12 ft/s the quickest time possible would be
the distance / greatest speed
= 120 / 12
=10 secs
If the rate of descent was slower, the time of descent would increase.
eg if rate = 10 ft/s
time = 120 / 10 = 12 secs

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