physics

A car travels along a straight stretch of road.
It proceeds for 11.2 mi at 52 mi/h, then
23.2 mi at 40 mi/h, and finally 48.2 mi at
31.9 mi/h.
What is the car’s average velocity during
the entire trip?

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  1. figure out how long the whole trip took
    t = 11.2/52 + 23.2/40 + 48.2/31.9

    and

    how many miles total?
    d = 11.2 + 23.2 + 48.2

    then

    average speed = d/t

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  2. since the was no change in direction, the speed is the magnitude of the velocity with no directions specified.
    ( poor wording of question, velocity is a vector with magnitude and DIRECTION. Speed is just a scalar. For speed use a speedometer. For velocity you need the speedometer AND a compass)

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