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March 29, 2017

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You ride your bike for 1.9 h at an average velocity of 10 km/h, then for 30 min at 11 km/h. What is your average velocity?

  • physics - ,

    Average velocity
    = total distance travelled / total time

    Total distance = 1.9h*10 km/h + 0.5h*11km/h
    Total time = 1.9h+0.5h
    So average velocity = ?

  • physics - ,

    11.25 km/h

  • physics - ,

    Average velocity is the total displacement divided by the total time.

    t1= 1.5 hour (time)
    t2= 30 minutes (time)
    v1= 10 km/h (velocity)
    v2= 18 km/h (velocity)

    d1= 10 km/h x 1.5 hour = 15 km
    d2= 15 km/h x 0.5 minutes = 7.5 km *convert the minutes to hour to get the answer 7.5*

    15 km + 7.5 km (add the distance) = 22.5
    ---------------
    1.5 h + 0.5 = 2 (divided by time) = 2

    so, the answer will be 11.25 km/h.

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