- #1

girl52

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**inelastic collision...kinetic energy lost?**

## Homework Statement

a bullet with a mass of 6 g is fired through a 1.25kg block of wood on a frictionless surface. initial speed of the bullet is 896 m/s and speed of bullet after it passes through it is 435 m/s. what's the final velocity? how much KE is lost?

## Homework Equations

ke lost=ke initial-ke final

ke lost=1/2mvf-1/2mvi

i got 11.2 m/s for the final velocity of the wood

## The Attempt at a Solution

KEi=1/2(.006)(896^2) + 0

KEf=1/2(.006)(435^2) + 1/2(1.25)(11.225^2)

i got 2408.228 - 488.925

thats not negative..where did i go wrong??

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