emily lives in a third-floor apartment. this morning, she walks downstairs to go to school. when she reaches…
emily lives in a third-floor apartment. this morning, she walks downstairs to go to school. when she reaches the bottom of the stairs, she realizes that she forgot her spanish book! she rushes upstairs, quickly grabs the book, and then races back down again. which graph could show emilys height above the ground over time?
Answer
Explanation:
Step1: Analyze Initial Height
Emily starts at the third - floor, so her initial height above the ground is non - zero. In the left graph, the initial height (at time = 0) is 0, which does not match. In the right graph, the initial height is non - zero, which is consistent with her starting at the third - floor.
Step2: Analyze Motion Phases
- First, she walks downstairs: Her height above the ground should decrease over time. The right graph shows a decreasing line at the start, which represents this phase.
- Then, she rushes upstairs: Her height above the ground should increase over time. The right graph has an increasing line after the decreasing one, which represents this phase.
- Then, she grabs the book (a short period of time with constant height) and then races back down: The right graph has a peak (constant height for a short time) and then a decreasing line, which represents these final phases.