Ricky walked away from a mall at a constant velocity for the first 30 seconds. He stopped at an ice cream parlor for 40 seconds.
He then turned around and walked toward the mall again at a constant velocity for 10 seconds. He met a friend, and they both walked away from the mall at a constant velocity for the next 20 seconds. Which of the following graphs best represents Ricky's motion?
2 answers:
Answer : option C
We analyze the attached graph
First, Ricky walked away from mall at the constant speed for 30 seconds
Second, he stopped walking for 40 seconds
Third, he walked towards mall at a constant speed for 10 seconds
Fourth , both walked away for next 20 seconds
So total walk time = 30 + 40 + 10 + 20= 100 seconds
Total time is 100 seconds. so we cannot choose option B and d because the graph ends before 100 seconds.
In option A, Ricky walked away from the mall after 70 seconds. so we cannot choose option A.
Option C is the graph best represents Ricky's motion.
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