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Homework Help: Velocity and Acceleration Parallel?

  1. Aug 28, 2010 #1
    1. The problem statement, all variables and given/known data
    If the object is not thrown straight up or down, is there any point along the path where the velocity and acceleration vectors are parallel to each other?

    2. Relevant equations

    3. The attempt at a solution

    I know that velocity would be positive, but while moving upwards, wouldn't the acceleration be negative because the ball is slowing down (neg acc and positive v=slowing down)? And vice versa for going down. At the peak, velocity and acceleration would be perpendicular because there is no vertical velocity at that point, and acceleration would be facing downwards.
  2. jcsd
  3. Aug 28, 2010 #2


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    Homework Helper

    Think: If the object is thrown at an angle it will have a horizontal velocity component and a vertical velocity component. The acceleration, as you said is always vertically downward. What do you know about the horizontal component of velocity?

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