- #1
anelmarx
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Homework Statement
Consider a bullet of mass m fired at a speed of Vo into a wooden block of mass M. The bullet instantaneously comes to a rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic energy U.
How far (s) does the block slide before it comes to rest. Express your answer in terms of m,M,Vo,U and g.
Homework Equations
None given
The Attempt at a Solution
(m+M)Vf=mVo
thus
Vo=(m+M)/m*Vf
and Vf=root of (2gs)
So
(Vo*m/m+M)^2 = 2gs
s=(1/2g)(Vo*m/m+M)^2
Now my question is if this is correct. I know this is the equation used when the wood is on a pendulim. Where is the U that they give?