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Acceleration and speed

  1. Jan 10, 2017 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    Since at N the gravity is now heading down towards the person in a positive direction it's acceleration is G, where as velocity goes up then comes down towards the person so it's velocity is now negative, thus -V, but the correct answer is A?? Why do both components stay the same?
  2. jcsd
  3. Jan 10, 2017 #2


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    Staff: Mentor

    Hint: Is speed the same thing as velocity?
  4. Jan 10, 2017 #3
    Yep, you're right, I confused speed and velocity. So now I understand why speed V is the same.

    But for gravity, why has that not changed?
  5. Jan 10, 2017 #4


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    Staff: Mentor

    The Earth didn't move? :smile:

    The direction of the gravitational acceleration vector in the chosen inertial reference frame is independent of the motion of the projectile. Down is still down.
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