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An indestructible bullet 2.00 cm long is fired straightthrough a board that is 10.0 cm thick. The bullet strikes the boardwith a speed of 470 m/s and emergeswith a speed of 250 m/s. (To simplify,assume that the bullet accelerates only while the front tip is incontact with the wood.)

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

m/s2

(b) What is the total time that the bullet is in contact with theboard?

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

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