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anonymous

  • 4 years ago

An arrow is shot straight up in the air at an initial speed of 15.0 m/s. After how much time is the arrow moving downward at a speed of 8.00 m/s?

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  1. anonymous
    • 4 years ago
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    final velocity = 0 0 = 15 + (-9.8)(t) t = 1.53 s That is only to go up. Coming down, initial velocity = 0 final velocity = 8 a = 9.8 t = (8-0)/9.8 =0.816s Add them up = 2.346s

  2. anonymous
    • 4 years ago
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    Awesome thanks!

  3. anonymous
    • 4 years ago
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    Alright quick questions, when I am working out the downward time I am getting a negitive number. Does that just indicate the direction of movement like with acceleration?

  4. anonymous
    • 4 years ago
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    gravity! set it's direction right.

  5. anonymous
    • 4 years ago
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    Time will ALWAYS be positive, no matter what. You need to cancel out the -ve signs using acceleration and velocity.

  6. anonymous
    • 4 years ago
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    Ok so when i'm going down gravity is positive then if i'm fighting gravity its negitve correct?

  7. TuringTest
    • 4 years ago
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    You can define either direction as positive so long as you are consistent in your work

  8. anonymous
    • 4 years ago
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    Yes. That is how most people learn it.

  9. anonymous
    • 4 years ago
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    Awesome guys thanks a ton!

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