Gregory is visiting his grandmother, who lives 200 km from his house. While traveling there, Gregory had an average speed of 100 km/h. Which of the following is true about Gregory's trip?
O
A
Gregory must have maintained a constant velocity of 100 km/h.
C
B
Gregory must have maintained a constant speed of 100 km/h.
Gregory must have stopped sometime during his trip.
Gregory must have completed the trip in 2 hours.
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