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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>