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Homework Help: Projectile motion on inclined plane

  1. Oct 19, 2016 #1
    1. The problem statement, all variables and given/known data
    As shown in the figure below, small object A is projected upward along a smooth slope forming angle α with the horizontal plane, with initial speed v0 in the direction of angle θ from the horizontal within the slope’s plane. The object continues to travel along the surface of the slope. Let us denote as h the maximum height that A attains on the slope, where height is measured vertically from A’s starting point. Find v0

    2. Relevant equations
    projectile motion

    3. The attempt at a solution
    I interpret the question as projectile motion with total angle (α + θ) with respect to horizontal plane.

    At maximum height, vertical speed is zero, so:
    vy2 = voy2 - 2gh

    v0 = √(2gh) / (sin (α + θ))

    But the answer is v0 = √(2gh) / (sin θ)

    Do I interpret the question wrongly? Or there is mistake in my working?
    Last edited: Oct 19, 2016
  2. jcsd
  3. Oct 19, 2016 #2


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    The angles don't add in the way you think.
  4. Oct 19, 2016 #3
    You misinterpreted the question. The ball moves "within" the slopes plane, I mean, it does not go "above" the plane.
  5. Oct 19, 2016 #4
    I get the hint. Thanks a lot
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