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 on a problem

  1. Feb 7, 2004 #1
    A 5.5g bullet is fired into a block of wood with a mass of 22.6g. The wood block is initially at rest on a 1.5m tall post. After the collision, the wood block and bullet land 2.5m from the base of the post. Find the initial speed of the bullet. I just need a little help on where to start. I'm confused because no velocities are given.
  2. jcsd
  3. Feb 7, 2004 #2
    Thats is what u have to calculate
  4. Feb 7, 2004 #3
    Try the reverse problem assuming the velocities.

    Divide the Problem into STEPS.

    1)First it is a projectile motion from the given information u can calculate the velocity(Bullet +wood system)

    2) now u have the final momentum(combined system) of collision so u can calculate the initial momentum
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook