Question

A scientist uses a submarine to study ocean life.

• She begins at sea level, which is at an elevation of o feet
• She travels straight down for 90 seconds at a speed of
3.5 feet per second
• She then travels directly up for 30 seconds at a speed of
2.2 feet per second
After this 120 second period, how much time, in seconds, will it take for the scientist to
travel back to sea level at the submarine's maximum speed of 48 feet per second?
Round your answer to the nearest tenth of a second.
Show your work

Answer 1

5.2 seconds

Explanation:

Traveling straight down: 90 * 3.5 = 315 feet down

Traveling up: 30 * 2.2= 66

315-66= 249

249/48= 5.1875 seconds

5.2 seconds <- rounded