1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding the angle of projection and its speed in 2D Kinetics

  1. Jul 28, 2015 #1
    1. The problem statement, all variables and given/known data: The trajectory of a projectile in a vertical plane is y = √3 x - (1/5)x2, where x and y are respectively horizontal and vertical distances of the projectile from the point of projection. Find the angle of projection and speed of projection.


    2. Relevant equations: 2-Dimensional Equations and maybe calculus.


    3. The attempt at a solution: Honestly, I can't even understand that how do I begin with this question. I've tried some wild attempts but they landed me no where :-( Can you please guide me with the solution to this question?
     
  2. jcsd
  3. Jul 28, 2015 #2
    Please post these attempts .

    However I still give a hint :

    What does dy/dx represent ?
    What is the formula for Range ?
     
  4. Jul 28, 2015 #3

    andrevdh

    User Avatar
    Homework Helper

    The angle of projection can be found from the gradient of the graph at what point?
     
  5. Jul 28, 2015 #4
    I figured out the formula for Ran
    I figured out the formula of range as: u2Sin2(theta)/g

    Can you tell me that how would it be done further?
     
  6. Jul 28, 2015 #5
    Sorry to ask a stupid question but what do you mean by point? Can you please show me how would it be solved?
     
  7. Jul 28, 2015 #6
    Here - dy/dx at x = 0 represents tan(θ) ( where θ is angle of projection ) .

    Find range , and then using formula for range find u .
     
    Last edited: Jul 28, 2015
  8. Jul 28, 2015 #7

    andrevdh

    User Avatar
    Homework Helper

    What does the trajectory or path of the projectile look like?
    What is the equation which describes the path or trajectory?
     
  9. Jul 28, 2015 #8

    NascentOxygen

    User Avatar

    Staff: Mentor

    Please attach your working for this.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Finding the angle of projection and its speed in 2D Kinetics
  1. Find the speed (2d) (Replies: 3)

  2. Find its speed. (Replies: 3)

  3. 2D Motion Find speed. (Replies: 1)

Loading...