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**1. Homework Statement**

An 9 g bullet is fired into a 2.5 kg pendulum bob which is initially at rest and becomes embedded in the bob. The pendulum then rises a vertical distance of 6cm.

What was the initial speed of the bullet? What will be the kinetic energy of the pendulum when the pendulum swings back to its lowest point?

**2. Homework Equations**

M1Vi+M2Vi=M1Vf+M2Vf

**3. The Attempt at a Solution**

For the first part how would i be able to find the final speed of the pendulum because to use vf^2=vi^2+2ax i would need to know the acceleration which is not given.

For the second part wouldn't the KE be zero since the pendulum stops at it lowest point??

thanx for the help.