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lmc489
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Homework Statement
You have been asked to design a "ballistic spring system" to measure the speed of bullets. A spring whose spring constant is k is suspended from the ceiling. A block of mass M hangs from the spring. A bullet of mass m is fired vertically upward into the bottom of the block. The spring's maximum compression d is measured.
Find an expression for the bullet's speed vB
Homework Equations
So basically i started with
Ki + Ui = Kf + Uf
and then manipulated adding in the equation for the spring constant, k
and ended up with:
rad[(2Mg +m)k/m)] * d but its totally wrong
help please!