Question

A submarine was situated 800 feet below sea level. If it ascends 250 feet, and then descends 50 feet, what is its new position?

Answer 1

Step-by-step explanation:

the new height will be 600 Feet

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Answer 2

Let's take sea level as our horizon: if you are on the water surface, your height is $h=0$ Also, let's assume a vertical axis pointing upwards. This means that the submarine, being $800$feet away from the horizon in the opposite direction with respect to the axis, will have a negative height of $h_{0 } = - 800$.If it ascends$250feets$, it gains altitude, so the new height is

$h _{1} = - 800+250= - 550 feet$

Note that this problem heavily depends on the coordinate system you adopt. In fact, I may have chosen an axes whose origin is set at the initial position of the submarine (which would have become the $h_{0} = 0$ ), pointing upwards, and the new position would have been

$h_{1} = 0 + 250 + 25feet$

The only things that won't change is that the new position will be$250$"more" than the old one. But if you want to compute absolute values, you need to specify a coordinate system, otherwise you may have as many answers as you want.