5.2g bullet moving@672m/s strikes 700g block at rest on frictionless surface. ?

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A 5.20g bullet moving at 672m/s strikes a 700g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 428m/s. What is the resulting speed of the block?

Plz help. I really want to know how to do physics.
 
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