Posted by **joey** on Thursday, December 9, 2010 at 3:22pm.

A bullet of mass 8 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 10 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

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**bobpursley**, Thursday, December 9, 2010 at 3:29pm
The momentum of the bullet: massbullet*velocity

that has to equal the momentum of the block and bullet combination at impact(mblock+massbullet)V set them equal, and solve for V.

Now, the initialKE of the block and bullet combination is 1/2 (totalmass)V^2

set that equal to the change in PEnergy

totalmass*g*height.

solve for height in terms of initial bullet velocity.

WEll, you know height, so you can solve for bullet velocity.

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