A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
a. ?500 km/s2
b. ?550 km/s2
c. ?360 km/s2
d. ?520 km/s2
e. ?275 km/s2
b
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