Ballistic pendulum

A ballistic pendulum is a device used to measure the speed of a bullet. A bullet of mass m is fired at a block of wood (mass M) hanging from a string. The bullet embeds itself in the block, and causes the combined block plus bullet system to swing up a height h. What is v_o, the speed of the bullet before it hits the block?

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Last Update: by Bro. R.W.Harris