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12 October, 15:55

A plane travels 350 km south along a straight path with an average velocity of 125 km/h to the south. The plane has a 30 minute layover, and then travels 220 km south with an average velocity of 115 km/h to the south. What is the average velocity for the trip?. a. 120 km/hr to the south. b. 110 km/hr to the south. c. 121 km/hr to the south. d. need more information

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  1. 12 October, 18:30
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    Average Velocity = Total Displacement / Total time

    1st part of journey, 350 km at velocity 125 km/h

    Time = 350 / 125 = 2.8 hours.

    2nd part of journey, 220 km at velocity 115 km/h

    Time = 220 / 115 = 1.9 hours

    Average Velocity = Total Displacement / Total time

    = (350 + 220) / (2.8 + 1.9)

    = 570 / 4.7 ≈ 121.3 km/hr

    Average Velocity ≈ 121 km/hr due south.

    Option C.
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