Q: A bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length l and negligible mass. What is the minimum value of v such that the pundulum bob will barely swing through a complete vertical circle?(adsbygoogle = window.adsbygoogle || []).push({});

I'm having alot of trouble with this question! I just can't seem to get my head around where to start, i've implemented the conservation of momentum equation;

mv(i) + MV(i) = mv(f) + MV(f)

as

mv = m(v/2) + MV

but i really have no idea how they want the question answered, or how to go about anwering it... :uhh: anyone have any insight?

Thanks for the time

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# Homework Help: Elastic Collision question

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