Question

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 less than -12 feet per second. Can the submarine reach the entrance to the cave in less than 10 seconds? Explain.

Answer 1

If the submarine descends at a rate of -12 feet per second, then at 10 seconds it will reach the entrance to the cave because if you multiply -12 and 10, you would get an answer of -120 and the entrance is at -120 feet below sea level.