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: Help! motion problem

  1. Nov 10, 2005 #1
    a plane drops a hamper of medical supplies from a height of 3000m. the plane`s horizontal velocity was 105m/s at the instant the hamper was dropped. acceleration of gravity is 9.8 m/s what is the overall velocity of the hamper at the instant it strikes the surface of the ocean? answer in units of
    m/s

    I dont get the problem, do I have to find the x component first? then what do I do after?
     
  2. jcsd
  3. Nov 10, 2005 #2
    Yes, you can use this to find the downward component of velocity:

    v2 = u2 + 2as

    Where v = final velocity
    u = initial velocity
    a = acceleration &
    s = displacement

    Then use pythagoras for the magnitude of velocity

    Regards,
    Sam
     
  4. Nov 10, 2005 #3

    daniel_i_l

    User Avatar
    Gold Member

    Remember that the horizontal velocity (x-component) always stays the same if there is no friction in that direction (like in this problem)
     
  5. Nov 10, 2005 #4
    Oh yeah, I forgot; my answer assumes that there is no air-resistance.

    Cheers for the reminder daniel_i_l.

    Sam
     
  6. Nov 11, 2005 #5
    thanks so much guys
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook