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# Answer to Question #1183 in Mechanics | Relativity for Jon Allen

Question #1183
A bullet of mass 0.00114 kg and speed v passes completely through a pendulum bob of mass 69.6 kg. &lt;br&gt;The bullet emerges with a speed v/2. &lt;br&gt;The pendulum bob is suspended by a stiff rod of length 0.449 m and negligible mass. &lt;br&gt;The acceleration of gravity is 9.8 m/s2 . &lt;br&gt;&lt;br&gt;What is the minimum value of v such that the pendulum bob will barely swing through a complete vertical circle? &lt;br&gt;Answer in units of m/s.
1
2010-12-08T07:45:28-0500
We should use the Law of the Moment and Energy Conservation :
mv = mv/2 + MV;
MV2/2 = 2MgL.
Here m - is the mass of the bullet, M - the mass of the pendulum, v - speed of the bullet, V - the speed of the pendulum after interaction, L - is the length of the stiff.

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