A bullet of mass 2.0 g has a speed of 250 m/s when strikes and penetrates into a fixed thick wooden block. If the bullet travels 25 cm inside the wooden block before it eventually stops, what is the magnitude of the average force that the wooden block applies on the bullet?

 a.    150 N

 b.    120 N

 c.    350 N

 d.    250 N

 e.    170 N

 f.    220 N