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8. A submarine moved from the water surface at a speed of (-20) m per minute. How far is the submarine from the water surface at the end of 7 minutes? (Hint: Consider the water surface level as zero.)​

User Jonsidnell
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If the submarine moved from the water surface at a speed of (-20) m per minute, it means it is moving downwards.

To find the distance the submarine is from the water surface at the end of 7 minutes, we can use the formula:

Distance = Initial position + (Speed x Time)

Since the water surface level is considered as zero, the initial position is 0. The speed is given as (-20) m per minute, and the time is 7 minutes.

Distance = 0 + (-20) m/min x 7 min
Distance = 0 - 140 m
Distance = -140 m

Therefore, at the end of 7 minutes, the submarine is 140 meters below the water surface.
User Seaotternerd
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