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    dejdev's Avatar
    dejdev Posts: 1, Reputation: 1
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    #1

    Jul 2, 2011, 04:17 AM
    Physics doubt ,please help
    A body covers half of the total time with velocities 40 km/hr and 60 km/hr for 2 equal distances and remaining half time with velocity 80 km/hr.find the average velocity of the body for the whole journey?
    Please explain.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jul 2, 2011, 06:18 AM

    Let the total time be 2t hours

    For the first half time, the body has 2 velocities, 40 km/h and 60 km/h for equal distances.

    Let the that distance be d.

    The time it takes to cover d is d/40
    The time it takes to cover the next d is d/60

    The total time is therefore d/40 + d/60 = t

    The last trip lasts for t hours.
    The distance of the last trip is 80t.

    Total distance is 2d + 80t
    Total time is 2t

    Average velocity = Total distance / Total time

    Can you work this out?
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