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an elevator went up 18 floors, down 6 floors, down 14 floors, up 19 floors, and down 25...

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BailyAndBella | eNotes Newbie

Posted September 22, 2013 at 7:56 PM via web

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an elevator went up 18 floors, down 6 floors, down 14 floors, up 19 floors, and down 25 floors.  what is the net change in position

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted September 22, 2013 at 8:36 PM (Answer #1)

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An elevator went up 18 floors, down 6 floors, down 14 floors, up 19 floors, and down 25 floors.  What is the net change in position? 

Up 18, change is 18.

Down 6, net change is 13.

Down 14, net change is 1.

Up 19, net change is 18.

Down 25, net change is 7.

The net change from the original position of the elevator is -7 or down 7 from the original position.

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amysor | TA , Grade 10 | Valedictorian

Posted September 22, 2013 at 11:41 PM (Answer #2)

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You start at 0. 

You go up 18 floors, so your on the 18th floor. 

You go down 6 floors, so your on the 12th floor.

You go down 14 floors, so your on the -2th floor (basement).

You go up 19 floors, so your on the 17th floor.

You go down 25 floors, so your on the 8th floor.

The net change from original floor is 8 floors.

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aszerdi | TA , Undergraduate | Valedictorian

Posted September 23, 2013 at 3:22 AM (Answer #3)

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If the floor you begin at is considered to be 0, and the term down refers to a negative value while up refers to a positive value:

up 18 floors= change of +18

down 6 floors= change of +12

down 14 floors= change of -2

up 19 floors= change of +17

down 25 floors= change of -7.

Your final position ends with a change of 8 units. If direction was also considered the change would be -8.

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