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: Inelastic Collisions

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data

    In the figure below, block 2 (mass 1.4 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 170 N/m. The other end of the spring is fixed to a wall. Block 1 (mass 2.0 kg), traveling at speed v1 = 4.0 m/s, collides with block 2, and the two blocks stick together. When the blocks momentarily stop, by what distance is the spring

    2. Relevant equations


    3. The attempt at a solution
    I attempted the solution but I am confused about the 170N/m
    How would I use that information and relate it to the equations of inelastic collision?
  2. jcsd
  3. Oct 18, 2009 #2


    User Avatar
    Homework Helper

    Find the velocity of the combined blocks after collision. Then find the KE of the the combined blocks.
    What is the expression for the energy stored in a compressed spring?
  4. Oct 18, 2009 #3
    ohhh okk i got it
    I had to use W=1/2kx^2
    they gave k and i figured out W through the KE equation.
    it was 0.33 m if you were curious.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook