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March 26, 2017

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a bus travels from one point to another wuth a speed of 40km/h and returns with a speed of 60km/h.what is e average speed and average velocity of the bus?

  • physics - ,

    since the total displacement vector is zero the average speed is zero.

    let i be unit vector from point A to point B
    velocity outbound = 40 i
    velocity back = -60 i
    (40 - 60)/2 = -10

  • physics - ,

    The average velocity is zero, but the speed is not.

    The total distance covered is 2d. The total time taken is

    d/40 + d/60 = 5d/120
    So, the average speed is 2d/(5d/120) = 48 km/hr

  • physics whoops - ,

    Whoops, sorry, Steve is right.

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