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.
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
