- #1

victoriafello

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## Homework Statement

a bullet of mass M is fired into a block of wood of mass m, the bullet sticks in the wood and causes it to swing upwards by height h

calculate the change in kinetic energy from the bullet to the bullet+wood

## Homework Equations

kinetic energy = 1/2MV^2

V = SQRT (2gh)

Inital speed = m+M / m Sqrt(2gh)

so initial kinetic energy is 1/2 M m+M / m Sqrt(2gh)

final kinetic energy is 1/2 M + m SQRT (2GH)

## The Attempt at a Solution

i know i need to divide final EK by initial EK but i am not sure if i have all the equations correct as when i try and do this i can't get to an answer

can anyone help>