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## 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 18

^{o}.

## Homework Equations

Find the bullet’s speed.

## The Attempt at a Solution

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