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!

Homework Help: School Projectile Motion Problem

  1. Oct 26, 2013 #1
    If a point of the parabolic path the velocity be u and the inclination to the horizon be θ, at what time the particle is moving at right angle to its former direction.
    I was trying to solve it using vectors.
    My friend gave me a clue of applying some geometry to the parabolic path given below:-
    He is definite that he solver it and the answer is = ucosec(θ)/g which is matching with the answer solving via vectors. Now he is not in contact, I was trying to solve this question.
    PLZ help me

    Attached Files:

  2. jcsd
  3. Oct 26, 2013 #2
    You are required by the forum's rules to show your attempt to get help here.
  4. Oct 26, 2013 #3


    User Avatar

    Staff: Mentor

    If you recall your functions classes, a line perpendicular to a line with slope m has slope - 1/m. What 's the slope of the line tangent to the first point on your diagram? So what should be the slope of the second point?

    Can you write another expression for the slope at the second point?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted