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: Projectiles with three boats.

  1. Sep 9, 2012 #1
    1. The problem statement, all variables and given/known data

    A destroyer simultaneously fires two shells with different initial speeds at two different enemy ships. The shells follow the parabolic trajectories shown.
    http://smartphysics.com/Content/Media/Images/Mechanics/02/Destroyer2.gif [Broken]

    Which ship gets hit first?

    2. Relevant equations

    3. The attempt at a solution
    I'm not sure how to figure this one out since they both have different initial speeds. But my guess would be the same time since they both have the same maxium height and therefore same "hang time"
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Sep 9, 2012 #2
    What is asked??
  4. Sep 10, 2012 #3
    i edited the question in
  5. Sep 10, 2012 #4


    User Avatar
    Homework Helper

    Write the formula for the height of the projectile. Equate them for the two shells.
    Write down the final vertical component of the velocity of the projection. Since it is zero for both the shells, equate them.
    Now proceed.
  6. Sep 10, 2012 #5


    User Avatar
    Homework Helper

    I like the way you are thinking!!
    Last edited by a moderator: May 6, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook