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    kevin_smit's Avatar
    kevin_smit Posts: 2, Reputation: 1
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    #1

    Feb 14, 2011, 11:53 AM
    Calculate the displacement and the velocity of the boat
    A boat travels 100 km [N], then 40km [N], and finally 80 km[S]. The trip takes 6.5 hours
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Feb 14, 2011, 11:57 AM

    Displacement is the vector sum of all the three parts of the trip. On a sketch, it is the distance between the final point of the boat and its initial point, with the direction indicated.

    The velocity is simply dividing displacement by time.
    kevin_smit's Avatar
    kevin_smit Posts: 2, Reputation: 1
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    #3

    Feb 14, 2011, 12:09 PM
    Comment on Unknown008's post
    Thanks man but the only thing I'm stuck on is if the boat is 140 km [N] of the point of reference and its saying that the boat traveled 80 km [S] is that subtracting 80 from 140. Or d0 I have to go from +140 past the piont of reference all the way down to 80 km [S]
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Feb 14, 2011, 12:14 PM

    Make a little diagram. How would you get the distance from the final point to the starting point? :)

    It's obviously (100 + 40 - 80)

    Is that okay with you now? :)
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