Question 7 ( Assume the velocity of a person traveling along a straight hiking trail is given by the graph depicted. The input to the function is time in hours, and the output is velocity in miles per hour. The trail travels east-west, and the velocity shown is the eastward velocity. Select all of the times when the hiker's displacement from their initial position at time t=0 seconds is zero. 4 O 10 O None of the above

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