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  1. #1
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    How do I solve this

    A 3-kg particle has a velocity of (3i - 4j) m/s. Find the magnitude of its momentum.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by jaycas21 View Post
    A 3-kg particle has a velocity of (3i - 4j) m/s. Find the magnitude of its momentum.
    Momentum:

    <br />
p=mv<br />

    so:

    <br />
|p| = m|v| = m\sqrt{3^2+4^2}=5m \mbox{ kg.m/s}<br />

    RonL
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  3. #3
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    No I got it also

    Yes I got that too but the answer are as follows:

    9 kg.m/s

    -12 kg.m/s

    15 kg.m/s

    3 kg.m/s
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by jaycas21 View Post
    Yes I got that too but the answer are as follows:

    9 kg.m/s

    -12 kg.m/s

    15 kg.m/s

    3 kg.m/s
    If you look carefully at CaptainBlack's work you will see that he simply forgot to multiply by m. His answer is the magnitude of the velocity, so the answer is 3*5 kg m/s = 15 kg m/s.

    -Dan
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