Bullet physics question, please help?

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A bullet with a mass of 12.0 g and an initial speed of 640 m/s penetrates 5.20 cm into a fixed block of wood before stopping. The average force exerted by the block on the bullet was

a. 74 N
b. 47000 N
c. 4700000 N
d. dependent of mass of block
e. none of the above
 
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