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: Help with a Simple Harmonic Motion problem!

  1. Nov 18, 2007 #1
    1. A 25.0g bullet strikes a .600kg block attached to a fixed horizontal spring whose spring constant is 6.70x10^3 and sets it into vibration with an amplitude of 21.5cm. What is the speed of the bullet before impact if the two objects move together after impact?

    2. V=A[tex]\sqrt{k/m}[/tex]

    3. I used the equation above, adding the masses together (.625kg). I got the velocity to be 22.26m/s... but now i can't figure out how to get the speed of the bullet.

    The answer in the book says that the speed of the bullet is 557m/s.
    Last edited: Nov 18, 2007
  2. jcsd
  3. Nov 18, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Use conservation of momentum. momentum of the bullet before the impact = momentum of the block plus bullet moving together at 22.26 m/s
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook