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2d Kinematics help

  1. Oct 20, 2014 #1
    1. The problem statement, all variables and given/known data

    A stone is thrown at an angle of 36.9 above the horizontal at 24.0 m/s from a building 56m high. What is the maximum height (with respect to the ground) that the stone reaches?
    2. Relevant equations

    3. The attempt at a solution
    No clue. Have a picture drawn and all my knowns and unknowns but not sure what the solution is, or how you arrive at it.
    Last edited: Oct 20, 2014
  2. jcsd
  3. Oct 20, 2014 #2


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    Staff: Mentor

    Check your textbook, class notes, or the web for suitable Relevant Equations. You should have a set of basic kinematic equations in your inventory of handy formulas (sometimes called the SUVAT equations of motion). It's not possible to have "No clue" if you're enrolled in a class teaching the subject :smile:

    So what equation(s) are relevant?
  4. Oct 20, 2014 #3

    Simon Bridge

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    Science Advisor
    Homework Helper

    Welcome to PF;
    There is a good chance that you have just been covering the kind of mechanics that this relates to called "ballistics". Does that ring a bell?
    You should go through your course notes for equations and examples to do with this.

    In all ballistics problems, a good place to start is:
    Divide the motion into horizontal and vertical components - and draw a separate v-t graph for each one: one above the other. Make sure the time-axes have the same scale.
  5. Oct 20, 2014 #4
    Here is my strategy to solve this question, forgive me if it is wrong:

    1) Draw a diagram of the situation (its good that you did it)
    2) Find the vertical component of the velocity vy using basic trigonometry
    3) Then find the vertical height (clues: consider the relationship between vy,
    g and t)

    Hopefully this may help you further!
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