The following is a graph of the position of a student in front of a motion detec
ID: 2163931 • Letter: T
Question
The following is a graph of the position of a student in front of a motion detector with respect to time.
The motion detector is located at a position marked -5 m.
(a) According to the above graph, which of the following does correctly describe the motion in the time interval between 4 s and 5 s?
The student is approaching the motion detector at an decreasing speed with respect to time.
The student is approaching the motion detector at an increasing speed with respect to time.
The speed of the student is highest in this time interval.
The student moves away from the motion detector.
EXPLAIN your answer.
Explanation / Answer
In the interval 4 to 5sec, slope is negative. So v is negative but it is neither increasing nor decreasing. It is constant. So first two options are false. In this interval for some time x is positive and for some time x is negative. That is the students moves away from the motion detector for some time and moves towards the motion detector for some time. So option 4 is also wrong. The only remaining option is 3. So 3 is correct. The speed of the student is highest in this time interval.
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