PHYSICS PROBLEMS - AVERAGE VELOCITY AND DISPLACEMENT


  1. The fastest fish, the sailfish, can swim 1.2×102 km/h. Suppose you have a friend who lives on an island 16 km away from the shore. If you send a message using a sailfish as a messenger, how long will it take for the message to reach your friend?

    Given   :vavg=1.2×102 km/h
                         ∆x  = 16 km
    Unknown:     ∆t = ?

    Use the definition of average speed to find ∆t
    vavg=
    x
    t

    Rearrange the equation to calculate ∆t
    t=
    x
    vavg

    t=
    16km
    (1.2x102 
    km
    h
    )
    (
    1h
    60min
    )

        =
    16km
    2.0km/min

         =
    8.0 min
    So the answer is 8.0 min
    -----------------------------------------------------------------------------------------------------

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