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Gunman
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Homework Statement
A bullet of mass 0.0035 kg is shot into a wooden block of mass 0.121 kg.
They rise to a final height of 0.547 m as shown. What was the initial speed (in m/s) of the bullet before it hit the block?
http://www.physics247.com/physics-homework-help/conservation_nrg_quiz1.php" [Broken]
There is a picture there on how the setting looks like.
Homework Equations
The Attempt at a Solution
K.E of bullet = P.E of the total mass at its final height
1/2mv(square) = (m+M)gh
(1/2)(0.0035)v(square) = (0.0035 + 0.121)(9.81)(0.547)
v = 19.5m/s
The actual answer is 116.5m/s.
Where did I go wrong?
Ya. Thanks for any help provided. And since this is my first time posting forgive me if there are any mistakes in the way I posted the question. Thankx again. =)
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