$\"\"$

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The velocity of air plane $\"\"$ is decreases $\"\"$ miles/h to $\"\"$ miles/h.

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Apply formula $\"\"$ , where $\"\"$ is final velocity, $\"\"$ is initial velocity and $\"\"$ is time.

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The velocity of air plane is $\"\"$ .

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The position of air plane is $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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The velocity of air plane $\"\"$ is decreases $\"\"$ miles/h to $\"\"$ miles/h.

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The velocity of air plane is $\"\"$ .

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The position of air plane is $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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When the air plane $\"\"$ is landing at time $\"\"$ ,

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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When air plane is landed the position $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ h.

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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$\"\"$

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When the air plane $\"\"$ is landing at time $\"\"$ ,

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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When air plane is landed the position $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

\

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$\"\"$

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$\"\"$

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$\"\"$ h.

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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$\"\"$

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(b) Graph the position functions:

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$

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(c)

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Find the distance between two planes.

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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Graph the function $\"\"$ :

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$\"\"$

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Observe the graph:

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If $\"\"$ , then $\"\"$ h.

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$\"\"$

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(a)

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$\"\"$ .

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$\"\"$ .

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(b)

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$\"\"$

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(c) $\"\"$ .

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Graph the function $\"\"$ :

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$\"\"$

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If $\"\"$ , then $\"\"$ h.