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Math Help - Velocity and vector problems

  1. #1
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    Velocity and vector problems

    Please help me with these two questions:

    Clarence leaves a dock, paddling a canoe at 3 m/s. He heads downstream at an angle of 45 degree to the current, which is flowing at 4 m/s.

    a. How far downstream does he travel in 10 s?
    b. What is the length of time required to cross the river if it is 180 m wide?

    thanks a lot!
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  2. #2
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    Quote Originally Posted by Soul to soul View Post
    Please help me with these two questions:

    Clarence leaves a dock, paddling a canoe at 3 m/s. He heads downstream at an angle of 45 degree to the current, which is flowing at 4 m/s.

    a. How far downstream does he travel in 10 s?
    b. What is the length of time required to cross the river if it is 180 m wide?

    thanks a lot!
    velocity downstream ... 4 + 3\sin(45)

    velocity cross-stream ... 3\cos(45)

    answer the questions
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  3. #3
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    thanks, I've got the answer now, It's about 6.12 m and 180/2.21=84.9 s.
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