# Ballistic pendulum

## Homework Statement

The ballistic pendulum is a block of 3.0 kg mass suspended from a thread 2.5 m long. A bullet with a mass of 9.0 g hits the block and sticks in it, the result being a deflection of the system by an angle of 18o.

## Homework Equations

Find the bullet’s speed.

## The Attempt at a Solution

all i know is t=2*pi*$$\sqrt{}(l/g)$$

Related Introductory Physics Homework Help News on Phys.org
use conservation of momentum to find final speed

and then use energy conservation principle

all i know is t=2*pi*$$\sqrt{}(l/g)$$
This won't help!

I agree with cupid.callin