Average acceleration of the bullet


An indestructible bullet 1.87 cm long is fired straight through a board that is 11.1 cm thick. The bullet strikes the board with a speed of 455 m/s and emerges with a speed of 279 m/s. (To simplify, assume that the bullet accelerates only while the front tip is in contact with the wood.)

(a) What is the average acceleration of the bullet through the board?

m/s2

(b) What is the total time that the bullet is in contact with the board? (Enter the total time for the bullet to completely emerge from the board.)

s

(c) What thickness of board (calculated to 0.1 cm) would it take to stop the bullet, assuming that the acceleration through all boards is the same?

cm

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Physics: Average acceleration of the bullet
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