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Physics 21 Online
OpenStudy (anonymous):

A 2.0kg wood block hangs from the bottom of a 1.0kg 1.0m long rod. The block and rod form a pendulum that swings on a frictionless pivot at the top end of the rod. A 10g bullet is fired into the block, where it sticks, causing the pendulum to swing 30 to a degree angle. What was the speed of the bullet?

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