A submarine was moving vertically under water. When it reached a depth of \(84\) meters, it started to rise again. Find its location after \(20\) minutes if it is moving upward at a speed of \(4\) meters per minute.
\[ = -84\,\text{m} + (4\,\text{m/min} \times 20\,\text{min}) \]
\[ = -84\,\text{m} + 80\,\text{m} = -4\,\text{m} \]
MR/Nasef.N
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